Apologies for being trivial, but there already is a maximum limit of entries per brewer - 80 in the beer category (or however many BJCP substyles there are), and probably a similar limit in Mead and Cider. So we shouldn't be arguing about whether a limit is acceptable, but rather what the acceptable limit should be. And I think it should be 80.
Then again, I got all 9 of my entries in before it filled up, and I'd probably feel different if I hadn't.
Also, I'm probably lucky in that I live in Bermuda - I have no "regional" entry center, and could just as easily have picked any of them (DHL, if you're reading this, I promise it's soda I'm shipping).