You should give a vouch copy to a trusted person who could vouch! but if you do that usually everyone if not most people who are higher ups here are pretty clever so they might figure out your trick.
There reall isn't much of a trick, it's a method. They'll be able to know what I do, which is why they must be extremely trustworthy.
I'd only be interested in giving ONE person a copy before they pay(because of how valuable the method is). I'm sorry, but you aren't even eligible for a vouch copy so I don't think you'd be the right candidate for this.
Ready when you are.
If it can be done more than once and depending on the required effort I would say $100-$150.