According to a news story, the game 'Darkspore' has been offline for players for over a week due to problems with the DRM, and the company's response is pretty much just 'The EULA says it won't always be available.'
PLEASE don't buy games with insane DRM systems. PLEASE don't assume that all games are like this - they are not!
Of course, on the flip side, I have thousands upon thousands of pirates playing my games, and whining that I'm a horrible evil person for not letting them update their stolen copies to have the latest patches, and that this makes me SO MEAN that they don't want to buy things from me. News flash: You already weren't buying stuff from me. Buy the game and the updater works just fine!