I have an ebay store. Ebay has completely changed the way the seller gets paid. Sellers can no longer use Paypal. Now you get paid through "Ebay managed payments". The buyer can use Paypal. But his payment goes to Ebay. They get their cut first. Then wait 24 hours before depositing your funds into your bank account. Ebay now charges around 13.75%. And is the total of the item, the shipping, and the sales tax.
My dad ran a repair shop for over 50 years. I listed a lot of OEM ag tractor parts. They sold quickly. Last summer I listed several OEM small engine parts. So far I've sold one crank shaft seal for $5.00. I also listed several NOS Echo weed eater parts from the early 80's. None of that has sold.