Lol with people getting sins around the world I would imigine prime time would be any time but then again, the place where people are likely get the game is in Canada and the US, so it would kinda make sense, BTW, Eastern Standard Time, is GMT -5 or GMT -4 (if you counting daylight saving)

Yea most people play single because not to many people have the time to in one sitting waste a few hours.  I don't nearly get as many online games as I wish I could.  In shooters you jump into a game with in seconds and mintues later you can leave when you have something else to do.  Low online player count is usually low in most RTS games accept for maybe ones that have very quick games like starcraft had.