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Of course, ebay does it for the money. Buyers go to ebay for the money, sellers go to ebay for the money, those who buy ebay stock do it for the money, and the ebay executives do it for the money.
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It seems like an easy way for ebay to deal with the sellers that avoid the selling fees by shifting the cost towards shipping.
The extra 2%-9% on the shipping doesn't seem like that big of a deal to...