Rhapsody, another DRM music service had a weird glitch where the few songs I purchased became "disconnected" from my account and no longer played. They were just music files sitting there doing nothing.
MSN Music did the same. Google Video went down as well.
I bought "2012" on Amazon's video on demand store via Unboxed (which is terrible btw). My family night was ruined. The DRM was so invasive to prevent stream stealing that the movie got glitched midway, would pause and never unpause, would not skip forward, and disappeared from my account after upgrading the amazon player. After 2 repurchases and 2 refunds, I just pirated it. The pirated version played great, but the family already got bored and went off to do their own things.
Pirates pirate to avoid money -> customers pay because it's easier -> companies use DRM to punish pirates -> customers end up getting hurt in the cross-fire -> DRM makes pirating the better option for both pirates and customers(former).
DRM isn't a stupid idea, it's a stupid execution of a reasonable idea. Steam's DRM is reasonable. The damage to the name however, is already done. Now I avoid DRM like the plague.