I agree it sounds fishy. Also, when I was part of the dog show world for awhile with my collies, it was standard to ship the female to the male for breeding. 10k out of the blue seems VERY fishy, the guy doesn't even know the dog's pedigree, he just saw him in the parking lot? That is definitely weird. In my experience a responsible breeder would meticulously research kennels and their dogs and pedigrees before making a breeding proposal..