yep, lost me as well....
the only thing i can think is are you saying, if you book a big name DJ, is he going to play stuff only that other DJ''s will know? in which case, if you are a big name DJ, you will know where you are going, know what the crowd will want to here and alter your playbox accordingly. i have seen plenty of big name DJ's who have done that and gain my respect for doing it. on the flipside i have seen plenty of notBig name DJ's who play what they want to, irrespective of the crowd/venue and flop. if thats not what you're talking about, i have got me coat...