Earlier quoted context omitted.
What most people don't realize is that Amazon fees are 15% and most suppliers do FBA which tacks on a more expensive shipping charge than you would have otherwise with USPS. eBay on the other hand charges 10% and sellers can ship items the cheapest way. Those same suppliers on Amazon list the their items on eBay for cheaper since they net the same after fees.
Using a few fee calculators & testing with a $100 item, it looks like they're comparable if the seller isn't using FBA. But, assuming FBA, then yes you spend a few dollars more than Ebay for the same item. However, selling via FBA can also give you a boost in sales with customers more inclined to buy when it will fit in their Prime subscription, and that increase in sales may outpace the increased cost. Also, at leas…
FBA is not a prerequisite for Prime eligibility. We sell on Amazon via Seller-Fulfilled Prime. They have pretty strict time tables for fulfillment to maintain eligibility, and you have to print your shipment labels through Seller Central, though you can link your own UPS account so not to pay extra fees.