I sell often, but I tend not to use Buy it Now, I'd rather start the auction at the minimum price I'll willing to accept for the item. Make sure you are clear about your postage and packing prices (check the weight and get a proper postage chart from the PO or check on-line, don't guess) and you can add a bit to the postage to allow for packaging materials. Yes people do buy things with a low starting price, I often start at 99p for small items because you don't pay a listing fee for 99p start prices. I wouldn't buy things, though, just to sell them - I only sell things I've already got that I no longer want/need e.g. ornaments, brassware, books, clothes etc.