I think its a pretty broad brush used to paint all car stereo as the 40 woofers tyoe of setup. The vast majority of the bass mobiles would be from younger type of ppl. Way I figure their car is really the only thing they own and so you won't see many of those ppl creating a massive bass machine in a house.

Car stereo competition is actually pretty focused on sound quality, granted there are db drag races as well but its two separate things.