The_Coyote
Emperor
I doubt that this is true at all. Steam is a lot like Amazon or the iTunes Store; it is a very convenient and efficient way to advertise and sell new games. I think that *far more* people will end up buying CiV simply because they will be exposed to it on Steam than will not purchase it because it's on Steam.
Not having a game on Steam is like not having a book on Amazon or a song on iTunes, IMO. You can still sell a lot without using these delivery systems. But you'll be losing a lot of sales.
You know this answer is a bit off from the actual discussion. It would only made sense if someone assumes that steam would only sell civ5 if the games comes with steamworks - and without steamworks they wouldn´t sell it.
The topic here is the implemention of steamworks - a game which is sold on steam don´t must have steamworks, it would only be true if Valve would demand it*. So the game could still be sold there (also not losing the sales there) without steamworks. Only the persons who will only buy the game because of steamworks (most likely person who only play multiplayer games and don´t accept [or like] any other mulitplayer platform or can´t live without ingame browser or steam achievements) would be lost sales.
* And that would be something that evil (it would only work if Valve would have the market power and would abuse this power) from Valve that it i wouldn´t believe it
Edit: i know sometimes the use of steam and steamworks is not really consistent here - which can cause misunderstandings