I ignore them once. They send me a fan request again, I delete them as a friend. That's how I roll.
See this is why I don't have a fan page or even many facebook friends. I won't go around requesting to be friends with everyone. If they want to be a friend then I assume they will find me. I wish all fan pages were like that.
Yeah, what La said. It doesn't have anything to do with posts to the actual fan page itself. It's the constant "So and so suggests you become a fan of ABC Designs," especially when it's for their own fan page. As long as you don't do that, you should be good.