to be one of the cool kids is why 99% of the people that start young do it. older people tend to do it as an escape or a way to forget.
personally i think it's a huge waste of money, but to each their own. i just can't stand being around drunk people because they are annoying as hell. you lose your inhibitions but also with that goes common decency. why would i want to be near someone that can't hold a conversation or even stand up on their own? some people find it funny, it makes me want to kick their teeth in 99% of the time.