Anabolic Steroids are a bit different than alcohol.

They are powerful little hormones, found endogenously, that have a large impact on your body.
People generally increase their use as their body is more capable of using the drugs and to get gains on an already large body requires more juice.
As long as someone isn't past the gains there body can acquire [and maintain] naturally than any amount above and beyond your natural androgen levels WILL yield results.
Personally, I only stick to few compounds ran at effectiven doses and try and stay below 1-1.5 grams of total androgens per week while "on". Currently, I partake in bodybuilding as a hobby I take very seriously... and take a lot of pride in. I can't think of any other hobby that can be as gratifying or productive... you are building on your body. But since I don't plan on being a professional, nor will I probably ever compete - I keep drug use to a minimum... enough to get the benefits while putting little risk on my system.
Its good to evaluate how far you want to take your drug use and stick to the limits you set for yourself. Many people here are not professional bodybuilders and quite honestly - don't need to huge stacks. And there is a point where the risk start to overtake the benefits. Everyone has a sweet spot (a point where the benefits out weigh the risks) which largely depends on the type of training you are involved in and your total LBM.