The idea of saving $30,000 or instead just paying $15 per month seems fairly obvious to most. And clearly, this ad from Microsoft starts off pretty strongly.
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But here is the problem – based on what I am reading here, you are only able to keep ten songs at a time to do as you wish with (own), while still having access to the rest of the music library via the Zune. Sounds neat, but it also sounds like a pain in the backside. Why? Stop paying that monthly fee and you own… ten songs. Lame.
Personally, if you must go with an alternative, consider the DRM free goodness of Amazon or iTunes own DRM free music options. You might pay more up front, but at least you can do as you wish with the music you are buying. Otherwise, try the Zune and the failed Napster model and rent your tunes.