RM -- I find it a bit distressing that your formulae do not include a factor for 'magic'. when I pick up a gun and discover the wonderful handling and fit that lights me up. THAT is where the value is determined. For me at least.
Actually, C, I do believe in magic guns. Unfortunately it is factual that no one gun is magic for all shooters. Rather, guns seem quite selective upon whom they shower their magic. This leads me to the conclusion that the closer a given gun's stock dimensions, handling dimensions, feel dimensions, aesthetics, etc. fit the shooter the more likely the gun is to become magical.
DDA