There are honorable people on Ebay, that is what feedback is for.
I have 78 at 100% positive so I have had my share of transactions and none of them bad.
A short story,
I sold a new lipo battery to someone last fall. I was paid imediately and shipped it out the next day via priority mail. I didn't get insurance or delivery confirmation, my mistake.
After 2 weeks the buyer emailed me wanting to know where the battery was, I went to the post office and they where no help at all.
Without delivery confirmation I had no way of knowing or proving he got the battery so I reinbursed him his money.
Several weeks later he sent me an email, he finally got the battery and sent me the money back, that transaction made me feel better about people in general.