I was going to set up a store and changed my mind a couple of days later. This is the last time. I wrote to Ebay to turn it off or I will close my account. I pay my invoices and have a 100% feedback rating. I guess it doesn't matter too much to them.
For me it was they canceled my purchase after I had already paid for it and told me I had to arrange for my own refund with the seller, turning a simple transaction into a giant headache with no explanation as to why it occurred.