I think you've got a really good game here. One that I could potentially spend a lot of time with, but I'm not willing to buy it because of the online activation system you guys use.
I'm aware of all of the arguments for why a company would do that, but, I've also been burned by trying to install a game only to have the developers stop supporting it or go out of business and then I can't play the game.
Is there any chance you guys will ever release a version that is DRM free? If you do, let me know, I'll buy it that day.
Edit: If this comes across as mean or attacking, I apologize, that's not my intent. That said, I'm disappointed when this method of DRM is used on a game I'm interested in.