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Ebay's fees (and PayPal's) are clearly set out in the Seller Centre and in the Help pages. Plus, you are clearly shown what the Ebay fees will be before you hit the 'Submit with above fees' button at the end of the listing process. So I'm surprised that your invoice has come as a surprise to you. Or are you saying that you never bothered to check...? If so, I'm amazed. That's the only way to know what prices you need to charge, or whether an item is worth listing here or not.
Ebay is not a charity, as you and so many others seem to bizarrely think. 
Do a simple web search to find out exactly what it costs Ebay to run these platforms...!
But no-one's holding a gun to your head and forcing you to sell here. Just drive your stuff to some rain-swept field, or list it on Gumtree or similar for collection, or advertise them in your local newsagent's window. You won't get exposure to the many millions of potential buyers that Ebay pays mega-bucks to provide you with, of course, meaning you'll achieve less (or no) sales and lower prices. But at least you won't have to pay Ebay's (or PayPal's) fees. 
