I think some of these guys just don't get it. Instead of achieving strength the honest way by just hitting the gym and working with a PT, they would rather take a few pills or injections and pump up quicker. Most of these players that take these illegal substances already have the skills necessary to be a champion, they just want to look more impressive in front of the camera.
I still remember when Mark McGwire was taking steroids and his biceps were so big that they had to cut the sleeves on his uniform, so he could fit his arms through. The Cardinals did have to order him special made uniforms and that's when the league became suspicious and finally checked him.
