OK, then the policy should be, “Have common sense, understand how expenses work, and what reasonable expenses are.” But their policy is “Spend our money like you are spending your own money.”
The latter essentially translates to the former. They're just trying to drive the point home.
Yes and no. If it's my money, if I don't spend it I will save it for another thing, so I have an incentive to spend less. I know they are trying to emulate the same incentive as a policy with that words. Personally I think that using the words "use common sense" would feel more honest.
How is them being vague and not saying what they mean “driving the point home”?