I don't understand questions like this. We will never know how much this guy, or that guy takes. Forget about the "I heard this..." or "My friend saw that.." Stories. Only the actual people know. I doubt most of them will ever talk.
And who is to say they take 'crazy' amounts of juice? I do believe dedication, will, drive and genetics play a greater part than juice. I think most Pro's are the ones that once fell in love with bodybuilding. Almost to the point that it consumed them. They probably would read, eat and sleep bodybuilding. So, of course they became the best they could be. Thats true for anything you have a 'natural' gift for, and give it 110%.
Ronnie Coleman might only take 300mg of deca a week with some anadrol. Kevin Levorone might take a gram of this or that a week. Who knows? I do know for sure, that they must have a great drive to succeed, and awesome genetics. If Pee Wee Herman were to juice, I have a feeling he wouldn't come out looking like Arnie. I think if you can make great gains with light cycles, take this life seriously, stay dedicated, eat good, and sleep, then you just might have good enough genetics and raw talent to make it as a pro one day.
So, who knows how much, or little pro's take. We may never know...