DRM also bores the retailers
After all, end-consumers are not the only ones bored by DRM. On a news published at Ars Technica, UK retailers are complaining too because "DRM is killing us".
As reported in the article,
Consumers are increasingly dissatisfied with copy protection systems that erode fair use rights and impose limitations on where and how content can be used. To make matters worse, market fragmentation has led to the emergence of incompatible DRM formats which often confuse consumers and leave them wondering whether or not the content they buy will work on all of their electronics devices. That makes file-sharing more attractive for some consumers.
Being P2P the only source of DRM-less music it is rather obvious that people are buying less and less from stores: who would want to purchase three copies of the same song (one for home Hi-Fi, one for car radio and one for the portable player)?