No one has ever asked me to breed any of my 3 purebreed dogs but then again I don't have everyday dogs except for my pug. But my mutt, Duke (at the Bridge) was a beautiful dog, well behaved etc. Many people asked asked if I wanted to breed him (during his 15 years with us) with there likewise beautiful dogs. Duke looked and we think was part or all Gordon Setter, my Vet beleived he was full breed but we will never know. When I adopted him the shelter said he as Lab and ?? (I forgot) as a puppy . He was a beautiful well behaved loving dog.
People do ask me if "I" am planning on breeding River but they don't have a counter part (another Swissy) so me breeding with them would not make no ense. Of course, any of Swissy friends wouldn't think of such a thing - we are all about keeping this breed true. He is neutered too and yeah, I have no idea where his papers are.
My uncle is BYB of labs and any lab that is healthy with papers he would consider as a stud for his dogs. I am sure if he got a chance to have a conversation with you he might ask if your willing too. That's is the way the BYB gets there studs and everybody is breeding and selling Labs these days.