At the end of the day, you do not
have to sell to
anyone, and, over the years, I have learned to say "No", as politely as I can. This always causes offence, however nicely you word it, so I wear a thick jacket and hunch my shoulders and go for it!
There is no rhyme or reason to a potential buyer, we are all strangers to start with and we are as diverse as the human race. There are really, really good, poor people, who you know will go without something to make sure an animal gets vet care, there are poor people who believe the world owes them a living.
Some rich people are really
very nice!!
But, at the end of the day, it is up to the seller to say "Yes" or "No", it is their animal right up to the point where the money is handed over, and there is no obligation to sell.
Buyers just need to be gently reminded of this, sometimes. I will not hang on for a buyer, now.