I don't think the eBay model works for relatively expensive and fairly complex items. You can't see before you buy because eBay don't want people to view and buy direct. I gave up and killed a listing after trying to sell a Carrera Crossfuse with no joy on eBay. eBay blocks attempts to send email or phone details. I wouldn't buy a secondhand eBike without trying it for size and getting an impression of the seller first. Similarly, I wouldn't expect someone not to try out something I was selling. In the end it sold for what I wanted from Facebook Marketplace with no fees, unlike eBay.