Most people couldnt give a fuck, thats why you dont see more of it.
Depends on the gym. I lifted at Golds, Somerville, Ma for a few years, which was loaded with meathead lifting types, and would occasionally have some pros stop in to train (DeMayo), etc..... Even there I didn't see what appeared to be too many natty 315lb bench presses.
Either way, most who start lifting and stick with it want to get stronger, especially in the early years. So I don't think it's not wanting to, I think it's because they can't.