Ok, these are really bothering me.
Considering that Sins of a Solar Empire, and Fallen Enchantress both now require Steam I think it's likely GalCiv3 as well. Just more convenient for them to distribute updates over a service 98% of PC gamers already use on a regular basis. Just speculation by me though.
I think that figure (98% of PC gamers) misrepresents the industry. According to the wikipedia entry I found on GOG.com:
Even under direct competition, GOG generated 14.5 percent as much revenue as Steam. [...] Steam enjoys a captive market of ardent loyalists, but GOG is swiftly becoming an attractive alternative and gaining loyalists of its own, especially in the anti-DRM crowd.[/quote]
That is not a small number. Those numbers wouldn't likely exist unless it really mattered to many people.
[quote who="Nathan E" reply="4" id="3404778"]
Not to flame you but why are you asking for a non-Steam version? Your asking for Stardock to spend probably significant effort on something that 99% of their users wouldn't utilize.
Alstein (who commented on this earlier with reply 16) is correct on the whole bit on Stardock attracting anti-Steam people. For a while, Stardock developed and owned Impulse. Many anti-Steam customers and developers jumped on board. Impulse was directly competing with Steam and growing fast. Brad said that if someone told him when Impulse just started, that it was going to be as big as it became, he said he wouldn't have believed you. But it grew so fast that looking back, Stardock had lost control over Impulse. Clearly, they couldn't keep up with the demand.
When Stardock sold Impulse to GameStop, it had angered a lot of people. Not just customers, but game developers too. To add insult to injury, the official announcement happened on on an April 1st (April fools). A lot of people were not happy when they realized that whole selling of Impulse to GameStop wasn't a joke.