Perhaps he won't resort to selling the gold after all? Here's the irony - the only way that selling used gold crowns would be profitable is if this competition significantly boosts his celebrity status which would add value to the chompers. If that were to happen, he wouldn't be so hard-up for cash and would want to keep the gold teeth because they are a part of his image. I think it's safe to say he'll be keeping them in until recurrent decay has its way with the teeth.
Good luck in the competition DJ Talent.