Most of the impressive bb.com "naturals" use OTC designer steroids and PHs.
And steroids aren't magical. Most recreational/moderate users (those that run maybe 2 cycles per year) will only have 10-20 lbs of LBM over their natural counterparts, if that.
Also, those narcissists on bb.com with dozens of pics are like Myspace whores. They only post the pics with great lighting and all that, making them look much better than they normally do.
So steroids aren't magical and don't make everyone huge, though if you want to be one of those ripped 250lb monsters (you know the ones I'm talking about), you basically need to abuse AAS year 'round.