http://www.stardock.com/media/stardockcustomerreport-2008.pdf (page 13)
The fantasy strategy game Stardock has also been developing a new fantasy strategy game franchise. It has been described on the Internet as “Not-MOM” (as in, Not Master of Magic). It’s a turn-based strategy game that supports random map generation, integrated modding, city building, unit design, tactical combat, multiplayer, incredibly powerful magical spells, and much more. It is scheduled to go into beta prior to June 2009.
In my opinion game required to be redesigned for multiplayer support. Currently it is too slow.
War of Magic had multiplayer. The problem is that it wasn't really the same game. Much of what was in WoM was stripped out, and MP was a very basic, limited affair. Wasn't really worth playing (even compared to WoM SP).
So that's the question here. Are we talking WoM style stripped down basic multiplayer, or Civ IV/AI War style "it's SP only with a friend you can play coop with"? Because one of those is easily worth $1 (or $5, or $10), and the other one is worth $0.
But people actually do play these games in MP. In fact, that's the only reason my best friend and I bought Shogun 2.