Eh, I don't know what the royalties are to sell something off Steam. It might even get the game more popularity. But apart from streamlining the game to support those forced updates it would require the manual / game guide in a digitized form, and I don't expect that this happens in any time soon.
Stardock (Totalgaming.net) would be more likely, if only because Brad Wardell is a fan of Dominions (I found the game via one of his posts on the GalCivII forum).