Interesting debate this one - in short some 'Big Names' will attract a few more through the door (Ginger always gets them in to the Plinston for example) but the right combination of DJ's will attract bigger numbers. I've had some on that have killed the place and others that have stood in at the last minute and really got the place rocking! It's a minefield and a delicate balancing act to get the art of promotion right.
That said I don't think Name DJ's are as essential as in the 70's/80's as people now, as Winnie stated, tend to go where their mates are going on the whole. Also, with the wealth of CD's etc available, travelling 100's of miles to hear exclusive tracks you cant hear anywhere else doesn't really happen that much these days (unless your travelling to see Butch or Soul Sam)
For me people like Hammie, Molly, Taffy, Lenny D, Fingers play blinding sets and yet are not considered, on the whole, to be Names. Hence the reason why I will be featuring more of them at the Plinston nextv year.
At the end of the day, as I always drone on about, it's the MUSIC that is paramount, everything else is window dressing