(i know it's photoshopped but still..)
Those are just 2 examples. I think they are ricey because, well, look at them. They are ugly, with unneccesary upgrades, when I look at them (especially the last) I think a kid who had a little too much papers and tape and just sticked it to daddy's car. No offence.
Now, just to show what I think are modified beauties:
That is a beauty because, it's modified, but it has a clean look, no overly agressive body works, no big difference in the paint, and it all in all just looks gorgeous
A little the same, a bit more body but still no "sharp edges", keeps the style, the paints work well together
Damn, I think EA and Universal has greatly infected my taste
And I agree on Ibo's rule of thumbs, I have a little the same thinking, the car must represent what's in it or less (meaning being a sleeper)