I could lay down KK after the flop if I saw one Ace on the flop, but pre-flop I consider KK at a minimum a 50-50 chance of winning. So I would probably go in. I would not mind losing to a better hand, I get upset when they win with a worse hand than mine pre-flop. This would be why it is so important to be sure you enter a ring game with only 10 percent of your bankroll.