Cingular Wireless is betting that you do. According to this post on Engadget, Cingular has made deals with some bands to release singles as ringtones before the singles themselves are released to the general public. Notably, Cingular has made a deal with ColdPlay to release their new single “Speed of Sound” as a ringtone 6 days before it is released to the general public at a cost of $2.49. Personally, I would advocate paying $0.99 for the single on iTunes, chopping a 30 second bit of the song, and uploading it to your phone, but you can do what you want.
It will be interesting to see how this plays out and what kind of revenue Cingular and the artists make from this venture.