You have to recognize that it was a different game back then. With bands and labels doing everything they can to salvage a bottom line these days, it's no surprise that the industry took a shift towards the "safe".Alot of bands have done alot of drugs and alot of drinking and done pretty well...Rolling Stones, The Beatles, Led Zepplin, The Who..etc. etc.
Now some of them are dead from to much partying and some look like they're dead, but it's hard to argue with their success.
Freddy makes a valid point, even outside his personal experience, bands that don't allow themselves to be distracted by things like drugs or alcohol tend to get further these days.