"It seems he was being hassled by some of our members privately about not being a site supporter."
This issue of members receiving unfriendly PM's has come up before. It's very easy to avoid these kind of PM's. I totally disabled PM's for my membership and hid my email from other members using my control panel. You can just allow PM's from a few buddies if you like. I also went to stealth mode when logged in that hides my online status so no one can stalk me in the forums.
If someone needs to contact me, they can do it in public on the forums.
Mark Griffin