When I worked in a really "big time" club and we hosted a "big time" guest DJ, I'd wait until the guy had been "spinning" for a few hours, then walk up to some guido - who'd likely coughed up upwards of $100 just to get in - and ask him when the "big time" guest DJ was going on.
"Yo, he already spinnin', yo!"
"Yeah!" the guido would reply.
"Fuck, I couldn't even tell the difference."
I wonder if this ever made a dent.