What is the typical power consumption in W for each type of routerboards with as much CM9 cards inside as it can house (i.e 3 cards in 153, 2 cards in 112, 4 cards in 532)? http://www.routerboard.com does not have such info 
RouterBOARD page provides maximul allowed power consumption for each board.
RB532 - 14W, RB112 - 10W, RB153 - 13W.
Board itself consumes without expansion cards: RB532 ~ 2-3W, RB112 ~ 3-4W, RB153 ~ 3-4W.
To calculate how much will consume RBXXX+CM9 card, find the CM9 card specification max. I and U, then P=I*U.
RB532+RouterBOARD52(R52):
R52 Imax.=400mA (typ. 300 mA); V=3.3V+/-10%
then RB532+R52=3~4W+((400*10^(-3))*3.3).