I'm not sure that they gained too much in terms of play as we won 6-0, 6-1 pretty easily. Given my low rating they probably also didn't gain too much in rating. It wasn't that bad of a match though as they were nice guys, and I had a practice match after anyway. It could have been much worse.
I agree it is fun to play up a bit, but there is a certain level where it goes from fun into being a ball boy. I've had that experience twice and do not want to repeat it.