Closest I've ever come is back in university, some guys asked me to make them GHB for $500/litre. That was right after it became illegal and every rave kid wanted to try the stuff. I know I was smart to say no, but damn, I could have been pulling at least a thousand a week....damn. Anyway, I know a few semi-gangsters and drug dealers and they live hard lives. Dirty business = dirty people.
It would be kinda cool being Tony Soprano for a day or two, but I wouldn't want to live that way.