I had an experience with another forum a few years ago which made me a bit warier. Admittedly I was dabbling in an area where you were likely to find more wackos but was a lesson learned none the less. While flogging underground videos on some fringe forums (on the side, it wasnt my primary reason for being there) I encountered a gentleman who said he was from a former soviet bloc country and begged me to give him a reduced rate due to his personal economic conditions/ exchange rate blah blah blah. I was about to go for it until he gave me a German address, at which time I balked. Over a period of months he decided to torment me with collect phone calls at bizarre times. Now the phone company and police arent too concerned with random anonymous phone calls placed from public phone booths in germany but it was a PITA. I gather he tracked me down by just using net tools and researching previous posts I had made but in the end it was just a case of waiting it out a while until I completed a move and changed numbers with a different name spelling on the listing.
As for my real name, anyone who PM's me will get it on my reply unless they gave me reason to choose not too. If I was an entity like a diveshop/owner/charter/instructor/magazine publisher Id be more inclined to hold it out front but I'm just another diver so who really cares. In the end those who know me know me and those who dont, just take my ID for all it is, a name I happened to think of at the time of registering, no more no less...