I hire about 1 in 5 of the girls I personally Interview but I always insist on a phone conversation before setting up an interview - this lets me weed out the sextards and saves me a bundle of time. If hiring modes that are traveling, I do most of it over the phone and often set up a web-cam chat. This helps a lot in weeding out those that don't meet my requirements. On initial contact, a very large percentage of the models responding to adds haven't read the requirements listed in the add or were referred by a friend that has no fucking clue what we do, even though the adds all list a url and detailed descriptions.
That said, when my ex was in the industry, she would get hundreds of responses from "producers" that couldn't read the big bold type that read "NO ANAL" requesting her for their anal sites. Funny part is, she really liked anal in her personal life but refused to do it on film - go figure.
Maybe it's more of a 'human nature' thing than just something we can attribute only to models
