I don't think I really see the point. I suppose if you wanted to spend the money you could, but it doesn't seem necessary.
Like Lauren said, reptiles are different from mammals. Bring a dog into the vet and they're going to do what? weigh it, listen to it's heart, take it's temperature, what else do they do? I don't know, I'm not a vet...feel around for abnormalities I guess. I don't know what a dog breeding check constitutes.
Most breeders will probably know the weight of their animal, the temperature it's kept at, if it is too fat or too small, if it's old enough, if it's too old, and by observation will know if the snake is acting strange. I just don't see the point of a vet checking for 'breeding condition' of a snake, when you can pretty much do it at home. And I'd imagine that could get to be super expensive for the breeders with tons of snakes.
What would constitute the vet saying that a particular snake is not in breeding condition? Unless it is a super intensive/intrusive vet check I can't imagine too much a vet would notice that an observant breeder wouldn't.