I think you are being perfectly reasonable in wanting them to go to naice homes.
We recently became proud owners of a pup, and although we are already dog owners, a different breed to ones we have had previously. I had been in touch with the breeder for 2 months before pups were even conceived, and was in regular touch with the breeder once the pups arrived.
She, quite rightly, heavily vetted us, via phone, email and by meeting in person. I had gotten to know her quite well via phone and email, and I think she was 'impressed' by the fact that I got in touch once a week to see how the pups were. She was an absolute gem and sent weekly pics of the pups, and at 5 weeks we were invited to choose a pup, although I knew it was also her chance to tell me that for whatever reason she would not be offering us a pup.
I don't think you are being judgemental at all. Owning a dog is at least a decades worth of commitment, and you have to be sure that potential owners have done their homework and know as much about the breed as possible. I read every breed book I could get my hands on, and scoured the net for as much info as I could. I also knew that I could contact my breeder with any questions I had, so it works both ways.
I would go so far as to say our breeder became a friend, and she sent me a lovely email once we had pup saying that if we ever wanted another one, to contact her. I know that if pup ever became ill, or we couldn't keep her, she would have her back, and she is always an email or phone call away, for any reason.
We keep in regular contact and I send her pics of pup as she grows, she has admitted to me that she loves people that stay in touch, I am in awe of her to be honest as our pup is an absolute gem and delight, and she started life under the breeder's care, so credit where it's due !
From her point of view she said she knew as soon as she spoke to me that I was the 'right' sort of person to adopt one of her pups, don't ask me why, I don't know ! I guess you get a 'feel' for people. I do know that she turned a couple of people down because they messed her about with visiting and wouldn't commit to seeing pups etc, and some rang with some strange requests/demands and clearly had no knowledge of the breed.
I think at the end of the day it is a personal thing, and you either have a good feeling about people or you don't, really, trust your instincts, I suppose.
Having waffled on for far to long I'll end now......
Hope this helps in some way. 