Not to be taken the wrong way but one definition of vanity is "lack of real value; hollowness; worthlessness: the vanity of a selfish life."
With out a multi-million dollar sports or sponsorship contract, using steroids to push just a little harder fits that description except maybe the selfish life. Unless of course one did risk their career and families well being for an extra inch on the bicep.
That's not to say accomplishing goals isn't a worthwile endeavour in the gym, in business, in home life or where ever. Personally I am a hugely goal driven and competitive guy in my real life.
A guy can get stronger, faster, bigger and accomplish physical transformation without steroids and frankly, in my personal opinion, doing it with steroids cheapens the goal, if it's just personal satisfaction being sought. It's like beating a video game with cheat codes. Fun maybe but you get my drift.
Just my opinion though, not hating juicers, have honestly considered it lately. And if I was in the running for pro contract in any sport, I would have needles in my ass so fast Flash couldn't stop me. And I do use supplements so again it just boils down to risk vs. reward, as anything does. We seem to agree overall.