I've had a few successful transactions through Armslist but for the most part it's just another pool of people for the spammers and scammers to feed from. They need to implement two way anonymizing relays like craigslist to reduce the BS replies. "Still Avail?" "I'd like to buy your listed item" blah blah blah. I don't answer them but it's a pain to deal with. PM would be another option. Then there's no email addresses involved.