The biggest problem with Monroe's derby is who sanctions it. ARCA, the roundy rounder people, don't know how to run a proper derby. They let too many cars in a heat, their rules are lax and what they do enforce is bizarre (having to retain the windshield, for instance). It is pretty much a good 'ol boy network, and the good 'ol boys, your Goffs, Snows, Songalewskis, etc. have been around so long that they can get away with pretty much whatever they want...team driving, sandbagging, extra welding and reinforcements to the cars, bringing extra cars, etc.
The other derby circuit we have in Michigan, USA demolition derby, runs a much tighter ship. You sometimes see a couple of the "Monroe mafia" in USA, but they rarely win..most of them refuse to run USA at all because they can't do as they please. Most of the derbys I've run in were USA, and you come away from those derbies, even if you got knocked out early, without a sense that it was rigged; that if you come back next time with a better car, you have a real chance to do better.