I would do one, the only thing I would add to Robin's list is that for me I would want each of us to spring for a "clean bill of health" from the vet prior to copulation.
Once the snake came out of QT, whoever had it, would take both in, get them checked, and we would absorb the cost of our own bills.
But as noted it would really depend on the person. There are a few people I would trust, but not many.
As noted, I could send a male to a person, what is to stop them from breeding that male to myriad females, etc., or to misrepresent clutch size etc. Again... trust the person you send your animals too.
But I am neurotic (I don't let people in my snake room even - moreso people with snaks that I do not know their husbandry first hand).
Bruce