I don't think the special forces analogy holds water. Consider this hypothetical example: If special forces train for 40 hours per week then they have a 70% c

I don't think the special forces analogy holds water. Consider this hypothetical example: If special forces train for 40 hours per week then they have a 70% chance of rescuing the hostages, but if they train 50 hours per week they have an 80% chance of success. Is it worth the extra cost? Absolutely. Having one special forces team with 80% chance of success is better than two teams with a 70% chance. But now imagine that my job is to install headlights into a car chassis. If I work 40 hours per week then I can install 70 headlights, and if I work 50 hours per week then I can install 80 headlights. Is it worth the extra cost? No - two people installing 70 headlights per week is better than one person installing 80 per week. Having said all that, it may be that "willingness to work 50 hours per week" is a good indication of passion and energy. If you ask a potential employee, "are you passionate?" the reply will always be "Yes". But if you ask, "Are you willing to work 50 hours per week" then you'll be more likely to get someone who loves the work.