Because you're paying for it twice. There is absolutely no reason to have to go through hoops to have content.
Means tons of wasted time.
And the two aren't even mutually exclusive, so again there is no reason why someone needs to bother with unlocking things.
Again you're not paying for the car, you're paying for the unlocking.
The car can be yours if you do the events, totally free.
If you don't want to waste time why don't you just play a MMO like Simraceway, all cars are unlocked there to be bought, why? Because there is an online game, and not a game with a career.
GT is a game with a career, there is GT Life for you to play, not as an extra the game is about that, the online is an extra.
But still if you wanna just save time, you can buy the "time saver pack" and get all your cars on dealer.
On a second note, you said about 'hiding' cars, and as I said on my first post, they shouldn't be hidden but be in the dealer with a N/A tag, which would become the real price tag after you unlock it.
No effort is needed to have in game content.
I don't know about you, but I really like playing my career mode instead of jumping into the dealer, buying up my 800HP R34 and go kick ass online.
This game is more than online, it should be great offline and online, it should have things that make people want to keep playing the offline career too, and exclusive prize cars would be the thing.
This makes no sense. If you want 'effort', delete your GT5 save and play GT5 forever, you don't need a new game. As for me, I'd like new content and physics, so yes I have a reason to want a new game, and a reason to not want to bother with boring game design like credits or unlocks.
You'd be surprised how many times I started over with my old GT games, but that is not the point, the point. The effort is needed, by what you said on the post before 'why spend time making this this and that' well why spend time making new cars then? When they can just copy paste GT5 cars, effort is not needed.
Well no, they should do the best to make GT6 a great online and offline game, even if that takes effort put into small things.