How does e-bay get away with charging the seller for shipping costs?

[bcbgcbrcb]

I never realized that this was happening before as shipping cost for baseball cards/photos is not very significant. Recently, I have been selling more large memorabilia items on e-bay, a lot of times, the shipping cost is close to equaling the final selling price.

I am just reviewing this month's e-bay invoice and see that I am being charged the same 10% seller fees for shipping charges as I am for final value fees. I am making nothing on these shipping charges, all goes to USPS, FedEx, etc. Doesn't seem fair to me, I'm sure that e-bay has everything done for legal disclosure but does this make it LEGAL?

I'm sure many legal action cases have been brought against e-bay for this so why try to "reinvent the wheel" but can anyone provide more insight on why this is right for e-bay to do?

Not that I would ever want this to happen either but auction houses do not charge their consignors a portion of the shipping costs that the buyer of that specific item incurs. What's the difference?

Looking forward to everyone's responses.