in my experience, the lower level ones are typically nice guys. I've never dealt with anyone much higher up the ladder than someone whos' pushing a few ounces here and there. mostly, its just been friends who know someone who has the shit.
i've personally never paid for anything but some weed.
some friends i used to have (whom i don't associate with anymore) started to get pretty heavy into dealing--begining to mingle with people higher up the ladder. i think they did pretty well for themselves for a while. i didn't ask any questions. i wasn't interested in the details at all, but i knew enough to know they were gettin pretty heavy. at some point, they ended up getting robbed real bad. it all went to shit and they ended up with a ton of debts to the guys they were getting fronted from. One of them doesn't even do drugs anymore, AFIK...i guess the bad-luck and the paranoia gave him a change of heart. The other one i think might be dealing again. he began to develop one of those wangster attitudes. i stopped talking to him.