Here's Ebay's policy on excessive shipping charges:
http://pages.ebay.com/help/policies/...-shipping.html
I've attached the first and last paragraphs:
Excessive Shipping Charges Policy
When listing an item using eBay’s shipping calculator, or specifying a shipping cost in categories for which eBay does not set maximum shipping and handling charges, sellers may charge reasonable shipping and handling fees to cover the costs of mailing, packaging, and handling. eBay will rely on member reports and its own discretion to determine whether or not a seller’s shipping, handling, packaging, and/or insurance charges are excessive. Shipping and handling fees may not be listed as a percentage of the final sale price.
Violations of this policy may result in a range of actions, including:
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Listing cancellation
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Limits on account privileges
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Account suspension
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Forfeiture of eBay fees on cancelled listings
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Loss of PowerSeller status