orcishgamer: You raise good points, I wonder if developers know how much they drive the second hand market and delayed purchasing decisions with DRM.
I can tell you how my habits changed, I bought an XBox 360 (I actually have 2 now) and mostly I play that. I also quit playing 2 of my favorite genres almost altogether: RTS and FPS. At a glance the industry might think of this as a win, but it's not, I used to buy games for buddies all the time and host LAN parties that encouraged the purchase of new games. I probably buy far less games total now and spend less yearly.
Lenny: DRM has had a major impact on my decision to go out and buy a new PC game. The two last times i did it was the first Bio Shock that had some draconian activation-based DRM and then Dawn of War 2 that forced me to install both gamecenter crap for windows and steam even though I bought a physical copy.
Since that time I've mostly bought games on GOG and bargain bin games for my consoles.
I've Also bought all Frictional releases twice to give them some support and have gradually began to buy some 3 year old bargains of Steam, figuring that if I can only rent the game its also only acceptable to pay a reduced price/"rent fee".
Like you I have stopped playing RTS after the experience with Dawn of War 2 and due to drm, dlc, and killing off mod support I have also stopped playing FPS.
Games that I'm currently holding off from buying because I'm unsure about their DRM status: A vampyre story, The Black Mirror, Black Mirror II, Black Mirror III, AvP 2010, Both stalker sequels, Grey Matter
It's interesting you mention both Bioshock and DoW2, both of those would have been instant buys for me. I actually would have bought multiple copies of DoW2 (I loved DoW and it was a regular feature at LAN parties). I didn't buy either due to DRM. I even avoided the Bioshock 360 release. If you read their forums they handled the whole thing piss-poorly and treated the very large number of people who had actual problems with derision (remember, this was before they got all the SecuROM stuff ironed out, they launched with 2 activations and no revocation tool).