Quote Originally Posted by sapi
Bethesda didn't go broke without it on Oblivion.

It will have very little effect on sales, but perhaps a negative one on community, if harsh measures are included.
In fact I'd argue that removing it would even have a positive influence. Ok, the DRM lobby would like to bash you over the head but a lot of players would hail you for it, including me. From a PR point of view I believe it's the way to go before everyone does it
And I'm almost 100% sure that it won't affect sales negatively. Practically all people buy the game because they think it'll be good and want to do the right thing not because they can't pirate it.
I'd even argue that of all the players who buy TW games the number of people who'd rather pirate it than buy it but are deterred from that by copy protection is definitely negligible (that is I believe it's lower than 0.1%)