Giving a woman, any woman, an orgasm is never a matter of ego for some people, myself included. It doesn't matter if I'm paying for someone to give me pleasure, if part of my pleasure is knowing that they're pleased as well. It doesn't have to end with an orgasm, either, as long as she's satisfied and enjoyed herself. I don't need her to fake an orgasm to feel good about myself, as long as I know she's had a good time. I've known a few women that have difficulty having an orgasm except under very specific conditions, but they still enjoy sex and all the activities that go along with it.