I gotta think that if you're a top, top bodybuilder (top 3-5) you're not gonna pay for your coach--aside from maybe a cut of the winnings. Just the name recognition and clout that comes from a coach being able to say "yeah i coach Phil Heath/Ramy/Dexter etc" has gotta be worth 10s of thousands.
Drugs I would expect they largely get for free, for the same reasoning. A juice dealer supplying a Mr O contender is big name recognition. Maybe not pharm grade GH though
But the cut the coach gets is money out of pocket just after the contest not before. No way a drug dealer gives free drugs for name recognition. The last thing in the world a drug dealer wants is recognition.