Upload & Sell: Off
include in your advertisement the statement "I retain the option to sell to whomever I choose, on whatever basis I choose, without regard to the order in which I am contacted." It's your item, sir.
Edit: I also recommend that you do a careful review of the buyer's feedback here on FM. Note especially for those individuals who claim hundred's of "Great" feedbacks that you carefully evaluate each of them on the basis of whether the feedback had to do with an item bought or an item sold. If you are selling an item that you consider a "high dollar" item, check to see if the potential buyer has a "Great" feedback record for purchasing "high dollar" items. At least in my view, YMMV, somebody who reports a hundred "Great" feedbacks for having spent $25 bucks on a hundred purchases of low priced items selling for say 25$, I would not regard with the same degree of confidence as I would somebody who bought 10 items at a price value similar to or above what I was selling.
Just my .02$, but if you'd like more data on that, feel free to PM me.
Welcome to FM. LIved in and near Erie 12 years; ran three marathons and numerous other runs on Presque Isle. Great city. I loved the three weeks of summer
take care, tony