The company gets no money for transporting an extracrew, right, but gets much more safety by doing so than by carrying a marshall with a weapon (who does not pay either and is NOT a crew member) at least we will not fire a gun!
Anyway, I think it's not worth to carry on trying to discuss about things you won't never understand (Nightstop) you match up to "the world is safer now" sort of forums where your contributions will be much more appreciated than in this one.
We got the idea mr perfect: we're doing illegal things (tax evasion) and we're putting the world at risk (despite the improvements in airpot security thanks to brilliant minds like yours), but once again, we'll keep doing it, it's a wonderfull benefit when you're away from home and a nice colleague takes you back home and (you're gonna love this!) 95% of times in biz class. I've flown in south america for a while and crossed the atlantic to go home every time I had a few days off in a row and I am very gratefull to the spanish colleagues that helped me!
Felices vuelos!!