I don't enter many of the PCA competitions but if you do win, the prize is free. Does it matter what the upkeep is? If you don't want it you can always "give it away" or "sell it". I entered a competition a long long time ago and won a Rover Metro. I would never have a Rover car anywhere near me, so I sold it.
I think I might try entering more PCA competitions, after all, if you're not in you can't win.