I was shocked by the lofty percentages eBay charged on basic things like reserve prices that are taken even if the item does not sell. A newspaper in a print world could justify charges based on actual costs, but the cost for them to "run" an ad for 7 days on eBay is practically zip.
It's price-gouging pure and simple and with eBay having zero competitors, why expect them to change anything about their shady business practices.
If you don't like them then don't use them. If you think their fees are too high then open up a competing vendor site of your own and discover what the REAL costs are to operate one. Also, price "gouging" is legally considered re essential items such as food, potable water, etc., and not "luxury" items.