http://pages.ebay.com/help/policies/sel ... tices.html
Some of the most basic things you can do are to provide accurate and consistent details about your item and to be clear and specific about the terms and conditions of the sale. You should also make every effort to provide excellent customer service from start to finish, including:
Charging reasonable shipping and handling costs
Specifying your handling time and return policy in your listing
Responding to buyers’ questions promptly
Being professional throughout the transaction
Be sure to follow the guidelines in this policy. If you don't, your listings may be removed, and you may be subject to a range of other actions, including restrictions of your buying and selling privileges and suspension of your account. Keep in mind that you could also lose your PowerSeller or Top-rated seller status.