Probably one of the biggest sources of buyer confusion after a listing ends is calculating the total price with shipping charges. Sellers can avoid a lot of this confusion if they make sure that they include clear instructions when they list their item. Using either a fixed shipping price or eBay's handy shipping calculator helps ensure that buyers know exactly what the shipping costs are, resulting in faster payment, fewer emails, and correct invoice and payment amounts. It's also important to keep shipping fees reasonable, since that is an important part of Detailed Seller Ratings.