breaking the rules is an important part of innovation though and pushing boundaries. Ya, some careers require strict adherence to rules, while others have to be loose and free.
I don't know one really really successful artist that doesn't drink or do drugs, even dating back to old old old times. Artists/musicians are supposed to be entertainers. It's our job to entertain people, and to show them how to have a good time. If we're boring, our crowds and fans will be bored and leave us.
Of course ya when were working on a album in the studio it's better to be sober. We have to focus on and practice the album.
But if we're throwing a party and have a large crowd, we have to be fun and crack open a bottle with them. Note: you should only drink a little bit if you're still performing or about to perform, (you need to be awake enough to perform, and people pay good money to see you!) ...after your show you can go to town with them at the after party.
If you're touring, ya gotta kinda chill out on the after party drinking tho. Night after night after night of heavy drinking will wear you down too much to make it to the next show on tour. ...but yes, drinking/drugs are ...a bigger than usual part of the rockstar/rapper/dj career, but you just gotta keep your work ahead of ya always.
There's a balance.