Hello :)
Maybe I'll try another approach...
Do you show your dog? Does he do well in the ring? If so you would be having people approach you about using him as a stud dog.
I'm sure you've seen the hundreds of stafford pups in the paper every week going for far less than a well bred dog would fetch :( These often end up going to people who want to use them to make themselves a few quid by breeding. It's diluting the breed, without much care for temperment of health checks and is, in part, what gets these fantastic dogs such a bad reputation

There are enough badly bred staffords out there without adding to the growing problem, I'm afraid. You only have to look in the many stafford rescue centers up and down the country to see that people don't care about their dogs as much as their dogs do them :(
Using him as a stud dog might also bring about aggression with other dogs and he may even start to cock his leg against your furniature... this could cost a lot more than the few quid you'd receive using him as a stud.