I'm about the only one playing the Devil's Advocate, but I don't mind. I'm just laying this out here for you to consider.
I know these loans happen, but I just can't see any of my collection getting loaned out to anyone. I've invested a lot of time and money in each bp I own- from the 0.1, 150g Mojave to the 1.0, 2000g Pied.
I cannot put a dollar value on a male that has locked with multiple females already this year- multiple times each.
Here is the most important point of the situation IMHO..... Your male is a proven breeder. Will the replacement be if something goes wrong? A good male is potentially worth as much or more than any female, because without the male you have no clutches

What if you end up with a male like his that won't breed? How much has it cost you to feed and maintain your initial $650 investment? It's about $100/yr, per snake for me just to feed a snake that size.
My $750 1.0 Pied is worth far more than my females he has locked with, because without him my plans would have gone south and I'd have 3 females sitting here looking for a mate of another morph than I planned. This boy takes a lot of rack space, but he's not going anywhere till I breed a proven replacement for him myself.