Power
Aside from the sense of power you feel from merely suggesting to someone that they do something and then watching them do it (you feel tempted to see if you can get them to eat a live roach, but you know it would be wrong, and besides, they did that on Fear Factor last week), the very nature of the job is designed to make you feel like a big shot. Someone paid handsomely for your services? Hook 'em up with a seat at the American Idol finale. How very "L.A." of you.
Sure, you're doing it to please and keep clients rather than out of the goodness of your heart, but there's no reason to feel bad about that. You are, after all, giving them the gift of music. And the gift of pictures of Jackson, Randy, or Andrew.