We've found that happens quite regularly Matty, but of course you would need to find the individual that just so happens to need your male at the time!
I don't think you can count everything on someone borrowing your boy to continue the line, but it certainly isn't out of the realms of possibility, for instance I currently have a loan of a beautiful golden boy from a good breeder to try with my girl, and I know Holly borrowed a male (Paws) from Souffle and Pophammy to mate to her cream girl Caramel.
the problem is of course, you wont be able to guarantee that your ham will be a show winner. All you can do is try to get one of the best in the litter, but sometimes this does not mean that he will grow up to take best in show every time! It only takes one hamster that scores more points, and sometimes the hamsters with most potential, never really seem to fulfill it. You also have to consider that it is likely that a hamster with absolute show winning potential will be kept by the breeder!
But as I said, not to say it can't happen. Pophammy's ww hamsters were from Wellington Hams and both have won BIS at the last two shows!