I don't mind copies, they're better than the original in features but not in quality. The thing is, though, they're harder to sell. Remember, that iPods are also a fashion accessory, so everyone always likes to have the original stuff when they brag to their friends.
I found that you get more profit with the original since eBayers like originals but from what I've seen copies sell well at certain markets. I'm setting up a market stall next month so I'll see how that goes.