I don't see a reason to replace a whole car. My car is 7 months old, and is in amazing condition. I have replaced the chassis once. Other than that the bearings 2 times. Clutch bearings obviously as needed and checked quite often. Diffs get rebuilt once a month. Shocks also get done once a month. Arms were replaced once. Shaft pins and drives were done once.
Some of you guys must have some serious cash to burn. Either that or you're sponsored and don't have to pay for parts.