How long does it take to acquire 50 cars? Not that long right?
70% of GT6 players, playing the game designed the way you want it, never get that far. How about 100 cars? A few more hours, a Christmas Seasonal that pays $6Million and boom, you're there.
80% of GT6 players never get there.
If this method of play you are touting is so engaging, why do the vast majority of people play the game for very few hours and then put it away? Or if they are continuing to play, why are they not acquiring a crap load of cars for their garage?
By my logic, the game should appeal to all kinds of users. I'm not asking you to take the
"all cars from the start option", just that it be an option for those that want it. This whole notion of the widespread GT fanbase enjoying grinding and the rewards they perceive from it is a myth IMO and the statistics back that up. Grinding to build a huge garage is no more popular than a great many things GT happily let fall by wayside from GT5 like rallying, real endurance racing, special events etc.
If you want unlockables, throw some of the expensive, iconic cars behind events and challenges with difficulty sliders so that we can all enjoy them at our own skill level. Design custom liveries only available to those that compete in the career mode. Give out trophies for the game only available in career mode. There are lots of ways to accomodate players that are into that kind of stuff, without handicapping the vast majority of players that it seems are not into it. It just takes a little creative effort, something missing from Gran Turismo gameplay and career mode for a long, long time