I've been a member for a few years. I mostly used the site for the forums. When i started making offers i'd always include my phone number. This was for two reasons, first i wanted the person selling to know i wasn't messing around. Second, i was a little worried about sending money to someone i didn't know hoping i'd get what was in the ad. So i guess it works both ways. But i don't think i'd buy from someone with no feedback. To sell not that big of a deal, imho.
Tommy
Tommy