You wont have luck with this. You dont have enough trust that anyone will try out your service.

On top... your suggestion to test out your service is of no value. Its not that people fear that you dont send them anything, they fear you send but charge back some months later.

So far that "test it out" is risky on another level too. For sure a scammer would send out small amount. But once the big amounts come in they stop their service. Thats what ponzies do.

So no, that wont work.