Body side moldings for $200? I doubt he'll get that, nobody I've ever heard of has actually INSTALLED these things, most people can't wait to get em off!
Those wheels are overpriced too! $530 each? Someone could get some nicer aftermarket wheels and new tires for that price. And you do need to specify what year they are from too, because there are two different sensors for the C5, one is from 97-00, the other is from 01-04, and they aren't interchangeable. So in other words if someone with a 97 wants to mount those wheels and it turns out the sensors are from an 04, they won't work.
I'm afraid your friend will be holding onto a lot of these parts for a long time if he doesn't price them a little more reasonably. Not trying to start a war here, just trying to help out. His prices are not in line with reality.