I think breeders that do not allow visitors is a sign of a sketchy breeder. If they dont care enough about their business to make their business secure, then I dont particularly want to buy from them. You dont see a small business owner that doesnt allow customers in w/o a blindfold and a background check because they may or may not be casing the joint. I think an upfront, honest breeder that has no problem showing a potential buyer the breeding stock of a particular morph they are interested in, as well as the actual speciman they are inquiring about is the way to go. With that said, I think it should be within reason. For instance, if someone is calling wanting to look at a pastel bp, then I think the breeder should allow the buyer to come into the facility and see the parents, grandparents if available, as well as the snake inquired about. However, a practice that may help the breeder out, while still allowing the buyer to come by, would be to have a "visiting" room set up so that the buyer doesnt walk through the entire complex.