Sorry you see it that way. If I change my mind, its my business. No reason to punish by screwing up someones feedback. Good to know how you feel though, lets me know who not to deal with on here. 
Now saying he wont sell it because he wants more money for it, is another thing entirely. Thats crap if he relists it.
OK it's your prerogative to change your mind, but whatever that item cost, your bidder(s) was budgeting his money to pay you for it, so by changing your mind, you've messed with that person's time and finances. He could have bid on another similar item during the time he was waiting to win your item.
If you had reservations about selling it, you should have pulled it before it ended or even better, never listed it at all.
I'm not saying you're a bad guy or a bad seller, I just said you deserved negative feedback on that transaction. That's what it's there for. It would be just as wrong for a high bidder to say "you know, I, uh, yeah.. I changed my mind. I'm not paying you, nevermind." Unfortunately ebay changed their policies a while back so that a seller can't leave neg feedback for buyers who do exactly that, which I think is unfair.
