I registered just to post that I have $25 ready to purchase US2, but I won't purchase it for Steam. I'll be more than happy to purchase a copy (perhaps 2), if you release it without DRM. I like to control when my software receives updates. I have a game on Steam now which the latest update has rendered unplayable with a non-Microsoft controller. The developer is working to fix it, but in the meantime, it's useless to me. And I have no way to roll back the version.
I also want to use US2 on my notebook that I do not use for games and have no intention of installing Steam for one application. Please reconsider your decision!
Thanks!