Just had a small revelation:
P2P file-sharing networks encourage social behaviour by the nature of download speeds being improved by larger numbers of people "seeding" after their downloads have completed rather than just getting what they want and then closing the transfer.
The RIAA on the other hand dictates how, when, and where you will make your acquisition, and exactly how much you must pay. If you break any of their terms, they will sue.
Fair's fair, but I know who I'd rather play with...