Final value fees are actually worse with an ebay store, but the insertion fees aren't as much. Not to mention you have the monthly subscription fee on top of it. ebay will get their fees no matter which way you do it. If you have Top Rated Seller status, you get a 20% discount on Final Value Fees, which does help take a little bit of the sting out.
See here for the fee schedule:
http://pages.ebay.com/help/sell/storefees.html
See here for the fee schedule:
http://pages.ebay.com/help/sell/storefees.html




















