There are other websites (eg Prosoundweb.com Live Audio Board
http://forums.prosoundweb.com/index.php#c1 )that require real names and personal identification for everyone who posts. I have not heard of any problems from that policy.
Sure there are lots of reasons listed online for protecting your identity in online transactions, but most of them are not relevant to this forum and marketplace. Yes, we all know about NSA and cybersurveillance, but thinking that the NSA, Google and other surveillance agencies can't figure out who is who and who is saying what if you don't give your real name is just naive.
RR, what are your favorite reasons why "protecting anonymity" is better than open, honest advertising of goods and questions about the items for sale?
On the other side, it is clear that anonymous, unidentified people can more easily misrepresent items for sale than if they had at least the accountability brought about by identifying themselves and being known to the forum community. Anonymous trolls would not feel as free to harass honest sellers with impunity than if they had to identify themselves and put their reputations on the line every time they made a statement.