People get carried away with the ebaying, it must be cheap if it’s used. I make a pretty decent side income selling on ebay now and sometimes the mind just boggles- a big part of my income is buying complete things, splitting them and selling the component parts- with my most common item, I can buy the complete item for £15-£20, sell one part for £20, another for £15, and then sell the leftovers for £10. It especially helps when it’s something that’s expensive on Amazon- people don’t shop around, they check Amazon for a pricematch.
Ebay psychology- I had some brand new stuff, put it on sale “new, in box”, slow to sell. Opened the box, relisted as used, sold faster- people search used items and don’t see new ones so will buy the cheapest used item without even seeing the cheaper new item.