Maybe you are correct, but Ebay is a hot shopping mess. Descriptions, categories, titles are a mess. Make a typo on Ebay and you won't find your stuff. Make a typo on Amazon and you still gfindet your stuff. Ebay is sloooow and requires critical thought to sort through inconsistent listings. Amazon has a faster website which takes you right to the lowest price and has Amazon Prime. Order on Ebay, get it in a week. Order on Amazon, get it in 2-days.
Amazon is neatly organized and the ease at which you can buy stuff is far superior to Ebay. Amazon reduces the friction to buy with one-click ordering and now their Alexa product. Need to do a return? Amazon gives your money back as soon as the item is scanned for return while returns can be painful.
Amazon lets people harvest local deals, stuff it in a 50lb. box, then send it to an Amazon fulfilment center where they handle inventory and shipping. If you are a good harvester, you barely have to touch the product. Using Ebay you have to harvest the products, store them, inventory them, and ship them.
Amazon is clearly continuing to innovate while Ebay lumbers along playing constant games with fees.
For full disclosure, I am an Ebay seller and investigating moving to Amazon.