You can block bidders with the ebay seller settings. Check this page. I
think you will find something useful.
https://www.ebay.com/bmgt/blockedbuyeractivities And also you can offer
second chance for second highest bidder if the highest bidder doesno...
Buyer paid and you did not ship because funds was on hold, am i right ?
When new to selling ebay holds fund for security purposes. There is no
possibility to leave feedback if there is no sale.
You can edit with the settings who can buy the items from your store by
allowing older customers and make sure to ship the item with a trackable
shipping carrier. + fast shipping. Dont worry ebay has a seller
protection also.