ET3D: Not really. DRM mostly doesn't bother people. You can remember that one case, but that's most likely because it was unique. You probably ran a lot of games with DRM where you had no problem. That's what usually happens with DRM, unless it's very heavy-handed. Steam works for most people most of the time. Sure, sometimes it doesn't, but that's like someone mistakenly bumping into you on occasion rather than a daily slap.
That wasn't the sole case, but the worst one... Also, if DRM wouldn't bother anyone, I honestly doubt there would be much of a market for DRM-Free Stores, and by extension, GOG.
Also, lots of people who don't care about DRM are usually less tech-savvy, since they don't realize it's possible side-effects, unless they get hit straight in the face by them.
And yes, Steam might not be the worst DRM and work most of the time, but frankly speaking, DRM is and will never be something good for the customer. And while it works "now", you have to remember all the games tied to DRM that became unplayble once either the online service got terminated or the very code of the DRM itself became unusable due to newer OSes / outdated coding.
And while Steam shows no signs of disappearing anytime soon, the very case that games can simply be removed from your library after you paid hard-earned cash is not something very pleasant to think about (and while the same might happen to GOG, you caould still play your games if you backed them up, as they aren't tied to an unnecessary DRM service that might prevent you from it).
ET3D: That's the kind of stupid speculation that brings DRM in the first place (although that argument is a little less in the air than your own speculation). All this "people might do this and that" that's backed by nothing is really stupid.
Neither stupid, nor specalution. What do you expect people to do when they paid for a game but can't play it due to DRM... Reselling? Nope, it's digital. Refund? Wasn't an option for years, and even now it's rather hard to even get a single refund. What's left? Not so legal means or being a "good lil' bitch and even saying thanks for getting screwed over".
Problem is, people blindly listening to the same old "it prevents piracy" lie are just further encouraging such behavior, instead of fixing things (or merely improving them).
Just think of it this way: "Some people pirate game X because they hate DRM", Publisher replies "More DRM to reduce piracy"... you really believe it's gonna change anything for the better? Doubt it, as it will ultimatively just piss off more people, some of which didn't even mind before, as DRM will just get more intrusive (and at the end, pirates still have the final laugh, while the honest customer gets the stick).
And while that's not the sole reason for which people pirate games, it's ironically one of the easiest to fight against, but rather than seeing their own mistake and fixing it, Publishers are pushing into the wrong direction and just digging themselves deeper into the hole.
And frankly, DRM or not, most games just tend to become avaible to pirates in less than 24 hrs after release anyways... so rather than wasting money fighting the inevitable (as there will always be people who will want things for free), publishers should rather wisen up and focus on pleasing the honest customers, rather than putting more of them off with always more intrusive DRM, which will inevitably happen seeing how things are heading...