Free shipping is an ebay scam.
They tell you to offer free shipping.
Naturally you are NOT going to give your item away for free for the hope of a higher spot in the search listings, so you add the shipping costs to your bottom line (ie: the cost of your item). The item sells with free shipping and ebay PROFITS from the increased cost of your item via the % of the sales price they take at the end of the transaction. Whala! You've been hosed.