Actually I acknowledged that there are people that will manage break their PC (through not knowing what they're doing or downloading nasties from dodgy sites) a few times a month. I'm not sure why I should care for their problems though?
As someone's said, the 30 day timer doesn't start until the 3rd install. So, say you have a laptop and a PC you game on, that's 2 installs. You upgrade the PC and get a new hard drive, that's the 3rd. Hard drive turns out to be faulty, you RMA it, get a new replacement drive, BZZZT can't install the game you bought for another 30 days. Why not? You're clearly a pirate. Or something.
Pirate downloads the game, installs it whenever he wants to.
Like I said in my last post, DRM is good if it does not get in the way of a normal user. As soon as it becomes an inconveniance, it has failed IMO. MeMeMeMe seems to be the perfect example of someone hurt by this, but people don't seem to be able to see it.
As for the MW2 thing, to be fair the steam group was open for anyone to join. Thus I'm pretty sure they were trolled by loads of people joining it because they played MW2, just for the lulz. Though I am sure a large portion of people did buy it anyway. The way I see it, if its a single player game, people will pirate it to avoid the DRM. But if its a multiplayer game, you can't pirate to play multiplayer anyway, so people will be forced to buy it, so DRM isn't really needed besides some kind of cd key that can be checked with the master servers, or is tied to an account, and that sort of system has been around for years.