Why do Seller pay fees in ebay and paypal ? : eBay Guides

Could anyone tell me., why only the seller has to pay for the selling an item in ebay.

 First he/she has to pay for Listing fees +gallery fees+ buy it now...etc etc.....

Secondly, if the item sold, he/she has to pay the final value fees..

Thirdly he/she has to pay for PAYPAL fees for recieving the money............

Do the sellers make profit? I don't think so...............

Do you agree whether seller makes a profit or not... Please vote your views.