Why don't they dress like professionals?
They used to, at the Mr. Olympia a few yrs back. But I guess they had a Shawn Ray Clause instituted. Because Shawn Ray would show up in expensive suits and look the part (cause he wasn't so outsized).
It gave a sort of legitimacy to bodybuilding, like they took it seriously. But of course the physiques were better back then, so what do you expect?