Once you've added all the booster packs, there are quite a few bunnies. Occasionally, we've had players with 6-8 bunnies in the Bunny Circle. Is there any limit to the number of bunnies a single player has in the Bunny Circle?
Are you killing them?
Because that's kind of the point of the game.
My wife and I were on a huge Killer Bunnies kick for a while. We actually went out and bought a shoe (like for blackjack) to hold all of the decks because we bought every single booster. But that just creates more diversity -- the mechanics are still comparable, you still bring out bunnies and kill them, it's just different bunnies that get pulled out.
The only limits I've seen are space related.