"not like ebay costs the buyer anything"
i would argue tha ebay DOES cost the buyer...you just don't see it because it's not in the form of a fee charged directly to the buyer. The seller may set a BIN price taking into consideration the $$ he's going to lose on fees. If it weren't for ebay and paypal fees, you'd probably be able to buy this Indian seat for $90. That's about what the seller's going to get after fees.