Heres a good question and something I've been thinking about!
I read an article on the net about how many steroid users are frustrated and spinning their wheels in a viscious cycle of gaining while using AS and losing when coming off. They spend their money only too lose strength,size and the money in which they spent when they come off.
They went on to say inorder to get the greatest benefits from AS bodybuilders must not come off their cycle but bridge down to a weaker steroid for a period of time before hitting another hardcore cycle.
I'd like to hear the pro's and con's to this approach. Obviously staying on indefinetly could have serious health consequences but his article rebukes that idea if one doesnt take 3 grams of test per week for 6 months straight.