1. I'm a Fedora Linux user. MP3 support is not free (not even free for windows). I don't want to have to pay for the music and the licensing fees to listen to it as well.
2. I see wma is cheaper but is not exactly legally to play on Linux. Not to mention with Bill C60-61 Microsoft could easily make it illegal for me to play songs I legally purchased via your site.
3. Because I rarely know what I'm looking for in music it would be nice to pay a subscription fee or bandwidth fee than for individual songs. I feel like I'm wasting my money downloading songs, at a per price, especially if I grab it and after listening to the entire song deciding it really wasn't for me.