Too Good To Be True? -or- I *heart* Queues

Hey, check out yourmusic.com. It's a site that for $5.99 a month, they'll send you a CD per month of YOUR choosing (from your queue) and also sell unlimited CDs for $5.99 each. There is no charge for shipping and handling and you can cancel anytime you want. What is the catch? It sounds great, but I'm still a little skeptical....