It's interesting, actually. The idea is that you should be able to set the price of your music, but there's quite a bit of weirdness and technical issues. For example, I'm selling an album I recorded on Amazon. It's a full-length, so you'd expect something like ~$9.99 to be the final price, but since it's only one track (21 minutes long), it ended up going for 99 cents at Amazon. I have no doubt that somewhere on the internet exists a form where I can edit the price, but it'd be a real pain to deal with. I'm glad selling music on Amazon/iTunes is a hobby of mine and not a business.