To keep from being a lousy player (by MLB standards). I suppose it could made the difference between a shot at "The Show" and languishing in the minors. Besides, I can see how a journeyman would expect to fly under the radar and not have anyone take notice. Harder to understand why a marquee player would take the risk. Probably to move up from the 3-5mil/year contract to the 10-15mil/year contract. Also, since so many crappty players were still crappy even after taking the 'roids, this would lead one to assume that all the roids due is enhance what is already though, to what degree, I don't know. In other words, if I took 'roids I could probably get my vicious heater up to 63-65 mph, up from 55-60 or that a guy like Barry Bonds (that sound you hear is pandora's box opening) is probably as good as the numbers suggest with the 'roids maybe adding 10% or so to his production so that all the home run record media bullshit that went on was just that, bullshit.