Why's that? Because for $25, all those older CD rips and music which was certainly acquired legally can now be obtained easily in 256 Apple lossless (edit: not lossless, duh). I don't know if I'd keep using the service, but that alone is, to put it bluntly, fucking awesome. I wonder if there will be some sort of limit on this to prevent abuse.
Edit: Any of the downvoters care to explain why I was downvoted for this post? Tone, mentioning piracy/abuse, hating iTunes? I'm genuinely curious here.