totally agree about the good faith...most breeders work on good faith as does the buyer. Most breeders will allow payments within reason, but there are those buyers that ask for more and more and more and may still walk away.
good example: friends story
little male - buyer says I have to have him!!! he is mine!!
calls every day all day for weights, measurements of everything but his butt, pictures of everything including his butt
emails constantly! a week goes by with every day all day phone calls or emails - asks for babys teeth to be cleaned, bile acid test, LP test before shipping - agrees on price - agrees on shipping - agrees on ship date - two days before shipping buyer calls and cancels, saying something has come up financially and she would have to back out of the purchase, yet the breeder as met all her conditions and terms also paying for additional vet charges. No deposits were taken what can the breeder do .... nothing!!!