More Digital Rights Management failures

There were two posts on BoingBoing today about customer hostile DRM causing legitimately purchased products to fail. Leaving aside the fact that DRM is unworkable from a cryptography perspective because the "attacker" is the same person as the indended "recipient" of the encrypted content, I wonder if the quality of developers has anything to do with how badly DRM tends to be implemented. DRM vendors seem to be snake-oil marketers, not technologists (see the Sony rootkit vendors) so anything they develop is doomed. At real software companies like Adobe and Microsoft I wonder if the DRM is built by incompetent or inexperienced developers because quality programmers might think that DRM can't work or is otherwise distasteful.