I signed up yesterday and have already tried buying 2 items. One guy wouldnt take venmo and another hasnt responded back and I have 10 post already. I cant help if I'm strictly a buyer for the most part.
Face to face with cash is the standard here. Straying from that will limit the potential deals done.
Post a lot and give the members a chance to get to know you. Flakes only post in classifieds and nowhere else.

