Gran Turismo's prize system needs an overhaul. The prizes in GT4 were at some points terrible.
First off, I do not want to race a one-make series only to win the exact same car again, especially becasue I despise many of the one-make races. I do not like the Subaru 360. Winning one in WR Mica blue will NOT make me like it. What good is the prize car if you are gauranteed to already own it because it's the only car eligle for that race? It's not good, it's just a duplicate that may not sell for much money at all. I don't like racing a car to only win it again. Some cars can even be won twice, like the Nike2022 (GT4) or the Mazda 787B (GT3). Again, we don't need duplictes!
Secondly, I would like to see a return of the randomized car prizes. Having the chance to win a different car each time you race increases the event's re-play value, as you don't know what you may win. However, the random pprize sstem needs improvement. In GT3, most races had 4 possible cars, usually of the smame class, like 4 JGTC's, or 4 hatchbacks. However, some were not even. The European series series had the prizes of a Lotus Elise, Nissan Skyline, Gillet Vertigo Race Car, or a Mini Cooper. The variety is terrible, a Class C, to Class As and a LeMans car? The Vitz race was another poor one. You had the chance to win a JGTC Supra, but you had a 75% of winning... another Vitz

. Even the GT2 enduros gave you a slim chance at a fantastic race car, with a great probability of just winning a rally car. If random prize cars are re-introduced, all the prizes for a particular race need to be equal, i.e. 4 Class Cs, 4 rally cars, 4 LMPs. None of this "1 good car, 3 lemons" Polyphony has been giving us so far.
Prize cars are one of the main incentives to race in Gran Turismo. Let's see some better incentive.