I am not sure that I have 'supported private breeding', or at least not in the way that you mean bran
.
We are getting a working Cocker in January. The breeder works his dogs, he has 6 in total. He breeds when he wants another working dog, the bitch he has mated he feels is one of the best workers he has ever had and he was keen to have a pup from her lines. So, he's keeping a dog, three were pre booked to working homes.Her previous litter was small, so he didn't advertise the 'spare' pups until birth.
I have been interviewed by telephone, then invited to be vetted and meet the parents. I saw all relevant paperwork. Then I was offered a puppy. Any money he makes from breeding pays for his dogs for the year, and to work them.
Am I giving money to the breeding industry? Yes, of course I am. Could I have got a dog to suit the intelligence and energy needs of our current Springer? Probably. But I can't help but feel that there are good, honest, decent folk out there that breed for the right reasons too.
And a lot of dodgy ones on Pre-Loved too 
I guess it's personal choice isn't it?
And I also can't argue with your points above Lady 