That's what I thought, therefore I think that your original post is something that is not being tracked or monitored and thus should not be a concern to anyone because it is impossible to prove the piracy through just the id3 tag and would have no merit in court.
I also do not think that Apple has the time to track, store and then turn over to the music labels for prosecution. It would also take a court order to get data from Apple by a Music label for prosecution of such data and Apple has their own problems with law suits right now.
Well, unless Apple is lying, the data is sent anonomously, and thus it would be useless in a lawsuit anyway. Also, I am not sure that poorly made id3 tags could stand up in court as "proof" of piracy.
But as radio loses a greater and greater percentage of market share labels are increasingly looking to other sources for play statistics, to track trends, to track user listening patterns, etc. THAT might be valuable.
Also, if it makes hte iTunes store more efficient, it could lower prices below those of amazon, etc for whole albums (I don't see songs moving from .99 for any time in the near future). That would likely drive iPod sales. Remember, unless apple is lying they don't make any real money from the iTunes store, it is just there to drive iPod sales. Supposedly, after paying the record labels and paying for upkeep of the iTunes store, there isn't much money there at all.