We have been tracking fees (among things for tax reasons) since the beginning of this tax year.

Gross fees across 2x ebay stores between both ebay and PayPal is currently 15.7% overall of total sales. Apart from the cost of our stock this is the highest single cost element to us.

Postage is 10.8%

Overall we end up with about 25% of total sales in profits after all taxes, fees, stock costs and other expenses.

But... We are happy with that. We can make a living from it.