The mould seems to have been set Matt, similar discussion on another thread at the moment but it seems only a certain set of DJ,s can be innovative and creative in compiling their sets cos its this certain set who influence what is supposedly right to be played, a lesser known DJ or collector can get up there and play away from the norm and accepted (which you rightly hint at) and the vast majority of punters won,t blink an eyelid ie theres hardly any "whats this, its fookin brilliant, never heard it before", but, somebody out of the certain set of DJ,s gets up and plays the exact same record or records, then theres a stampede to find out what it is, the fickleness of the scene prevents fresh DJ,s with fresh playlists from prospering, hence the same repetitive playlists. Just an opinion by the way
Kev