I spend quite a bit of time on ebay and know what you mean. I dont certain criteria that every seller had to meet to buy from. I basically look at how much I'm spending, I never buy from someone with under 10 feedback and if the item is over 100 bucks, then I try to buy from someone with over 100 feedback and at least 97% positive. As a seller, there isnt much you can do, I have only had 2 people not pay me for an item, so Im doing pretty good. Also, I do not allow shipping outside the continental US under normal circumstance, but I have shipped to canada and alaska before but that was if the buyer asked and he had good feedback.