Very good post. :) You might be interested in reading about the ways people use manipulative tactics to get past our boundaries, such as fear, obligation and guilt. It is very hard to resist these tactics, but once you recognise them, it becomes a tiny bit easier.

Again, I appreciate the post. As I tell some of my sweeter and more service-oriented friends (who are regularly taken advantage of), if you don't want to do it, just say NO! You don't need a reason beyond that you don't want to!