So what??. . .
Sure they rip you off a bit but at the end of the day, where else can you expose your sale items worldwide? I challenge you to talk it to some 2nd hand shop and see what cut they take. I sold Xbox 360 games not long ago for £2 each and I see them selling for £10+ as I speak.
So either you lose 10% of your total winnings, or 80%. . .
P.s. Not backing eBay or PayPal here but they seem to be the lesser of all evils.