Everybody who plays racing games for more than 3 weeks after initial release would. But that audience is not the core for achieving high-sales numbers.
Cars are what attracts general audience and make for tasty reviews and pleases the media and general public. Cars are main casual-audience selling point because cars are object of wishes for ordinary people. Driving games create an illusion where Average Bob can drive Ferrari, Lamborghini, Mercedes and Porsche. OK, maybe not Porsche.
Because of that tracks have become less important in overall picture and developers gladly accepted that. Tracks takes more time to create, licensing tracks can be expensive, traveling and visiting real-life locations is also expensive, detailed tracks are pain in the ass to program resources-wise and *saving* on tracks looks like a viable solution. Hell, who am I kidding. It IS a viable solution.
I will never get bored of highlighting original F355 Challenge game (PS2 version). One single car. 10 tracks. And Magic Weather engine. Magnificent, magnificent game.
However, emphasis on cars - and Forza does it deliberately, from Jalopnik to Top Gear, it is all about the cars - and trends in modern marketing and promotion will leave all players who seek for their tracks unsatisfied. And unfortunately, that tide will be hard to stop.
