Yeah, but the way the Car Collector mechanics have been implemented is not even that - it's just T10 trying to swell some numbers to keep Microsoft shareholders happy, while minimizing the amount of effort needed on their part. There are many things that could be implemented, and more importantly, many things that could be avoided, to make Forza more popular with a casual audience.
Again, it makes total sense from a business standpoint. After all, videogame development is undoubtedly a capital-intensive industry, so you want to keep the people holding the purse strings happy, and the satisfaction of the fans is only one of many means to that end. Our economic system in general is not geared towards customer satisfaction, but towards achieving the maximum possible results with minimum efforts, and predictable outcomes: hence why this year's movies are all copycats of last year's blockbusters, why we'll get an iPhone 11 which is almost the same as the X in a few months, and so on. If the guys at T10 were just artists developing their product out of pride, and had no need to "put bread on the table", I'm sure even in its pursuit of mass appeal Forza would take a quite different shape.
Whatever. I just hope that with all the cars that are unavailable for purchase and aren't worth the hassle of a Forzathon or League participation, next week won't be another repetition. And I'm not saying that just because I want that goddamn Sambabus.