Anytime you list an item, you are charged a fee (anywhere from .10-$15)
anytime an item sells you are charged a final value fee (anywhere from 20-30%)
then people almost always pay with paypalso that's another 3%
when I sell a $400 header I pay roughly
$45 in final value fee
$4 listing fee
3% paypal fee
shipping
I lose %30 of my profit to eBay , 15% gross sale to eBay
That's why they make a ton of moolah