Well, I've read almost all posts and I've found some interesting ideas and some plainly radical and stupid. I'm also able to see that some people still misinterpret me, so I'll explain my OP a bit better and also discuss some of the responses to this thread.
First of all, I do agree that the more premiums the merrier, but here's my argument regarding "Unwanted Premiums". With GT5, PD has given us a pretty though time because they took 5 years to bring us 200-odd cars and they apparently aren't willing to bring us more (I could be wrong, but DLC so far looks like a far-away dream). In this set of 200 cars, you'd expect them to bring the creme de la creme, the all time favourites of GT players merged with the fantastic new supercars and performance cars of the world. They did gave us some of that, but they also wasted (there's no other word for it) time on cars that the majorityof GT players (and therefore, payers) will not ever touch because they don't find them appealing in any level. Yes, there might be some players who like them and some people who excuse this, but I have strong reasons to believe this is indeed a mistake. And apparently other people, who commented on this thread, have them too.
I agree that diversity is a major factor in the GT experience. Driving cars you didn't even knew existed and being surprised with pages long forgotten of automotive history is amazing stuff, I can't deny that. I loved the amazing amount of cars in GT4, covering a somewhat wide span of interests, power ranges, years, and nations. However, I don't see how grocery-getter cars (Because, let's face it, the hybrids, K-Cars, and all that kind of cars, are commuter mobiles. Period.) mean in any form "Enjoyment", "Diversity", or "Interst" to the majority of GT players, or car nuts. If I wanted to drive a piece of metal that was designed to haul kids and not exhilarate boys, I'd get my ass off my chair and go drive mom's Fiat to the grocery store. You want the "real" driving simulator? You're better of with real driving then...Traffic jams, speed limits, boring and un-inventive cars, etc. Don't get me wrong, I don't want either to have only race cars and big turbocharged monsters in GT, because then again it would ruin diversity. But I want stuff that could be considered by 80% of the players and petrolheads around the world as "Fun", or "Exciting", "Cool", or "Interesting". Sometimes this means fast, sometimes it means new, sometimes it means awkward. In none of the cases it means ecologic or mediocre. Cars are a showcase of human capacity in engineering, and car games are designed to do nothiung more than showcase cars. So why showcasing cases of human mediocrity like 60HP Suzuki shoeboxes? They're such amazing feats of technology that said previusly mentioned Fiat could run rings around them at a racing track. Having to mention twice my mom's car brings me to another point.
Apparently, a lot of people want his/her/his dad's/his grandpa's/his first (or whatever) car in GT. But the thing is, I don't. And I don't think a fraction of the people who bought a car game would want them. Did your father drove a Turbocharged SAAB? Sure, that would be enjoyable to drive for most people. I learned to drive in a Renault 9 and a Mexican-made VW Jetta 1.6, I hang around with my mates in a Land Rover Santana, and my mom owned a Renault 4. I'm terribly fond of said cars, but I admit they would fail to interest anyone who has any interest or whatsoever in cars or racing because they don't know all the stories and experiences behind such cars. So, I don't go around GTP saying "Uhh I want a Renault 9 because I love the car", because I know most people still think it's a useless french crap-box (Even Top Gear does). Get over it.
On PD's defence, I have to go against the argument of "Duped" racing cars. I've noticed it, all SuperGT's and NASCARS, even being the same base model, and having the same mechanics, and being identical to the physics model, are uniquely modelled. A proof of this is their interiors. However I'd think PD should say the Nissan GT-R Super GT500 is one car, albeit with 5 different "liveries" (Although actually, as I said, not only the livery changes).
Then there's the absolutely invalid argument of PD not being able to get the cars for them to model. This is undeniable false. It's not hard to get a nice car to model, and I know it. Somebody else said here already that when on the Bugatti Museum at Le Mans he could even sit in a Pescarolo. I, for example, have been in a series of car sites in Europe and I've been able to get close and personal with a lot of high profile cars. I'm no VIP, and yet I've been able to behold and photograph R8 LMPs, historic Porsches, classic BMWs. I've even been to the Lamborghini factory, where I took a tour inside it and saw the #13 and #14 Reventons being made. Imagine if I was some big CEO man with plenty of money in my pockets (Because, to me at least, $60M is a hell of a budget for a videogame), I could be allowed even to start their engines in the museum. Even here in Colombia there's a Ferrari dealership, if I had enough money I could go there and they'd allow me to photograph every inch of an F430 and they'd even give me a test drive. PD has trademark licences and big money, therefore they can model pretty much whatever they want. This argument gets even weaker when talking about mass-produced cars. Things like a Scirocco R, a Seat Cupra, a new BMW Z4, a 500 Abarth, a Volvo C30 T5. How hard can it be to go to a showroom, showing a big fancy trademark agreement and asking the people there to show you the car? Finally, this argument dies with me saying "If other car games can get hold of X car, why can't GT?". Sheesh, even low-budget modding teams for games like Rfactor and GTL can get to model cars and in a quite astonishing quality given the resources they have. Not being able to get the cars? Invalid, sorry.
Also, there's the people who keep yelling "Speak for yourself. I love driving at 20MPH in a Prius". Unbelievable. Of course I'm speaking for myself, as a subjective human is all I can do. But, feel free to prove me wrong, other people have expressed they feel the same in one way or another. I'm trying to give voice to a majority. A majority akin to the one that gives Top Gear an estimate amount of 300 Million viewers around the globe. A majority composed of car nuts, petrolheads, appreciators of engineering, lovers of thrill, car fans, and not car bores. If you want a game tailored to your exact needs, then GT is not the game for you. If you want a game with all millions of variations of Miatas and Suzuki Crapuccinos, sorry, GT shouldn't be for you. Why? Because it's a mainstream racing game. It's dessigned to cater what most people what, and what most people want is exciting stuff, not boring K-cars that can only be appreciated by anoraks. I, and I bet at least 75% of the people who bought GT, don't want this cars and would like others instead. Why? Because I want fun. It's a game, and I want to do things in it I can't do in real life, like doing a road test of the most recent hot hatches, winning the 24 Heurs Du Mans, driving a one-off Ferrari, and things like that. Again, if I wanted to drive all day at 60mph in an ugly shoebox, I'd become a cabbie.
There are other problems with GT5 car list, as I've pointed in my OP (and will point again, because I've thought of others) but this one is critic. All cars going in the GT franchise from now on will be premiums and if they keep wasting their time on unwanted premiums, this ship is going to sink.