USATODAY.com - Music-subscription services can be a good deal: "I remain an unabashed iTunes junkie. But an alternative model - the 'portable' music subscription - is growing on me."
It seems that subscription music models are suffering the same fate as TiVo - you can't really appreciate the value of it UNTIL YOU TRY IT. Because of my music subscription (tied in with some social networking features), I found 3 new bands that I like... TODAY. I believe that this scenario is just not feasible in the current iTunes model. In fact, you can argue that the audiences are totally different... I (and a wide range of others like me) employ a music service to discover new artists. iTunes users generally discover their music outside the context of the service and then proactively go there to purchase something that is "on their list".
I think the onus is on the marketing departments of these subscription music services to communicate the value of discovery. You are not "renting" music you would otherwise buy... you are discovering new music that you would have otherwise never noticed. For me, that is certainly worth the equivalent price of a few sodas a week.