Can refuse sale to certain buyers

[chamberlains_786]

Hi 

I have some fixed price listings on sale. I want to know is it possible that I'll cancel certain orders I receive , what could be the reason I should provide. It's just because to avoid rather than going into a big trouble later on. It might sound stupid but I'm sure I'm looking for this 

thanks in advance 

[tobiasd4]

Your items are immediate payment only,

so if you cancel & refund payment, you will still pay fees & expect bad feedback from buyers, too many of these & ebay may suspend you.

Why do you want to refuse sales?