My concern with the net sales comparison is that I think for eBay that only includes their fee, not the actual retail price of the goods, whereas for Amazon it

My concern with the net sales comparison is that I think for eBay that only includes their fee, not the actual retail price of the goods, whereas for Amazon it is the entire price of goods sold. That to me seemed a much more apples-to-oranges comparison which is why I didn't cite it. I have no idea what's actually true. I would be interested if someone wanted to sort out the truth there but I hit my limit for how much more research I want to do.