I agree with you guys. Disappointing your Dom is probably one of the worst feelings in the world. I think it's a lot like self punishment, you know you did something to upset him and it can really take a toll on your mental state.
Sure we all act a little bratty just to get those swats that we love, but we know when we've crossed the line and we feel it. It's an awful feeling to know that you're a disappointment.