- Individual sellers in this sector struggle to get seen among all the big corporate offerings. Let's make a marketplace to help them find and connect with customers!

- Wow! Now small businesses in this sector can make real money! <-- here is where the original business plan ends

- So much money that new people are trying to get into the sector now...

- That means there's money to be made selling the ability to enter the marketplace to those people

- Big businesses are happy to franchise their offerings out to people who want some of that sweet marketplace money

- Market economics of a never-ending supply of new rubes looking to get a piece of the action, and the dominance of the big suppliers, makes sure their resellers' margins are cut razor thin, and big business collects the bulk of the revenue

- Marketplace ends up full of get-rich-quick-scam victims undercutting and driving out of business the very small sellers the marketplace was set up to benefit

AI means you can skip the MLM scam component of the process and just destroy the marketplace with sock puppet bots.

The difference between ebay and others are several: much better search. It's set up to allow customers to target what they want. Better filters. It includes the capability to have a complex user defined search that emails any new items that meet the criteria to the customer. Layers of search: one set of results can be searched to provide another set. It's amazing how other sites don't do this.

The result is that ebay provides benefit to customers that in practice is not so easily gamed by big sellers. It gives you very, very, very niche results. E.g. arts and crafts pottery of a particular vintage and maker and color.

I've found replacement parts for kitchen implements that haven't been manufactured in 20 years.