the moment someone shoves a camera in your face, you know something's up. and you can deduct that you may be shown somewhere, meaning free promotion and also that you'd better not be coming across like a total tit or greedy bastard.
if they wanted it to be credible, they'd have to use hidden cams and ask for permissions later, which is not only likely to cause a lot of hassle, but would also show up how useless most of the contestants really are, so it will not ever happen.
i was cringing at that Karen's comment las night. persistance gets you the price you want. well, yes, but not by being in the face of the seller who could easily guess you really really want that item and will keep the price up. basic suplly nd demand thing, which Karen, the supposedly great business woman (not going to comment on why she really made the career she had so far) should know. persistance means knowing where to get alternatives and thus having the upper hand. without cameras there, Jamie'd have paid 200+ for that tikka.