I have an easier time mentally justifying storing up low OP cards for a more expensive action (queuing) than I can in stacking the deck (culling, but I am not sure that this is what you are referencing).
With queuing, I tend to think of it as knowing you have a bad harvest, lack of political will, etc and so concentrate the meager resources in fewer, more critical directions. Besides, without queuing some games like Washington's War or FtP (which I think has it) would be pretty tough for one side to do much of anything.
Depends on the war really. When you're talking about getting McClellan to move, you are overcoming more than just materials.
