Logic I never really understood.
I do not understand the concept of vouch copies. Sure the trusted members get their free legitimate copy of whatever the OP is selling. But then what is the assurance that the seller will not scam after the vouch copies are given? Now do not tell me that the vouch copies are just to confirm if the goods exist. Cause that is just stupid.
Well you have two things really: vouches and vouch copies.
Vouches are usually given after a trade has been (succesfully) completed, to indicate someone has some experience as a trader and can be trusted a bit more (personally I don't value vouches at all: past performance is no guarantee for future results)
Vouch copies are usually being given with eBooks etc.
One person gets the eBook for free and will then (usually) confirm the eBook is as described.