2. Inefficient unit selection is charity to your opponent.

Producing forces that have an unfavorable cost to effect ratio is the equivalent to handicapping your economy, sabotaging your military, and aiding your oppenent; of which, all of which are counterproductive.  Encouraging or supporting others to engage in such activities is thought crime.  Some units will have high costs to produce, but they are only expensive when their expected effect does not justify their cost.