A smart move Syn! The otherway around may work, adding a female or two to your balls cage requires nothing extra. You could just take notes re observations of matings for the owner, but again, If you plan on getting anything out of the deal, (babies) Get it on paper and signed, or simply get paid cash (stud fee) before you return the animal).
Bare in mind, there will be no garantee your male will oblige, or if he does, success.
Without proper acclimation/cooling etc and without another male or fresh male shed, it dosent always go so smoothly. It also depends on the acclimation and willingness/health of females, which is another important issue to consider.
Risk of disease, particularly viral like IBD (fatal) OPMV (fatal) or/and external parasites like mites, not to mention possible damage if they just dont get along.
Snake mating ,though generally not as harsh as lizards (rape) can get nasty if things go wrong. The slim possibility of cannibalism is another point.
I think you made a wise descision.
I would do a cash deposit then u get ur BP back and its in the same shape as when it left u return the deposit
Not quite as simple as that DJ, Diseases can have a long incubation period and be costly to test for/diagnose, and if its either of the two nasties above, its too late by the time you find out.