Alexrd: Still, their games have online activation, which for me ends up being the same thing: your game is still tied to an internet connection/3rd party server.
For me it is about two separate issues (which both are issues to me when I consider buying a game):
1. Always-online requirement is vulnerable to internet hiccups. I may actually be more vulnerable to this than many PC gamers, as I am gaming on laptop(s) almost exclusively, and do that many times elsewhere (outside my home) where the connectivity is many times in question. In many places, I seem to barely get very slow and flaky GPRS/EDGE connectivity (with a mobile 3G USB stick), and this is even in the urban area here where I live.
2. DRM that requires online authentication only during installation: for me this doesn't have the issue mentioned above. I think the only reason I consider this an issue is if in the distant future the authentication server is taken permanently offline for any reason, preventing me from (re-)installing my game(s). Legitimely, safely and hassle-free (meaning, no 3rd party pirate cracks). So naturally I prefer DRM-free games over these too.
In some ways, I consider #2 a bit similar (but still worse) _potential_ nuisance as some of those games that don't have offline updates/patches, but the only way to get the latest updates is to install the game, and use the in-game automatic update function. So, if those update servers are ever taken offline, apparently I'll be stuck into playing those games with the initial buggy 1.0 versions. Such games as Rise of Nations and Rise of Legends (aka RoN2). Apparently the publisher (Microsoft?) has hunted down sites that tried to offer the latest patches as offline versions. Apparently their idea of DRM, ie. you have to register your copy online in order to get fixes. The update servers for those two games still seem to be operational at the moment.
Games that fall into category #2 can get to my shopping cart, but mostly only when I feel I will play them in the near future (coming months), and I'm also inclined to pay less for such games.
Games that fall into category #1 will hardly ever find their way into my shopping cart, or at least it would have to be a very exceptional game. Come to think of it, I don't think I have so far ever bought a game so far that would require always-online connection, even if we are talking about online multiplayer games. (At some point I was close to buying TeamFortress 2, but luckily Valve released it for free a bit later, so I didn't have to.). Or then I am forgetting some title I have... But multiplayer games are a different case anyway, because there is a valid reason why they need to be connected to internet all the time (duh!).
Games that don't require online authentication at all, I buy pretty much unrestricted, even if I'm unsure when exactly I'd get around to playing them. Might be next week, or 5 years from now, doesn't really matter.