Well some of this stuff isn't cheap. Those tacky rims full of chrome cost quite a bit from what I understand. I forgot to mention that the stereo systems they put in there are so loud that they will cause an ear ache, that isn't cheap either.
Some of this body work can be expensive, but the i-Vtech sickers are the cheapest "upgrade" why just one of those stickers increases your horsepower by 10 hp, so one person had 10 so they successfully improved their hp by 100.
While I'm thinking about it, maybe I should add some i-Vtech stickers to my car, no wait I have a better idea, I'll add HEMI stickers because we all know how much those stickers add (30 hp, maybe 40 hp).