Maybe my memory is failing me here, but wasn't it Gamestop who caused Stardock problems with Demigod by allowing people to buy it before the servers were ready? If so, then I imagine, Brad required some convincing before he sold impulse to them.
I can understand WhiteElks caution. The PC gaming market at the moment, is in my opinion, very consumer unfriendly. I am very wary about picking up games these days for the PC. Given the fact that there are no refunds on games once the box is open (at least where I live) unless the CD is damaged, and the DRM implemented by publishers, I really try to check out a game in everyway I can (without pirating) before I commit to buying it.
Fact is that in some peoples eyes Gamestop has a long way to go to prove themselves. I guess the question that needs to be answered is should they be given that oppotunity. I have a great deal of respect for Brad, so personally I'm willing to wait and see what happens with Gamestop. If things don't work out then I'll simply stop using impulse which is a shame, because I love Stardock games.
Brad from his postings, seems to be the sort that won't let grudges get in the way of profitability. That's a good thing on his part.
As for Gamestop, I don't trust them nearly as much as I trust Stardock, but I trust them more then Valve. The only thing this sale does is switch my 1st and 2nd preferences in DD.