I agree Terry, hopefully the promoter chooses the D.J because they would suit their club, but I've seen D.J's booked because a promoter has enjoyed them at another club (where they have gone down well) but not considered if they would suit their own club (Basically just 'blindly' booked em)
It can be torturous for the D.J to find himself in that position, so if their 'research' makes them come to the conclusion you mention above - that the club doesn't play what they like (or at least what their 'forte' is) then that is when they should politely decline the booking - I got asked to D.J at a place in Northampton the other month by someone who hadn't seen me D.J for years, I said to leave it that month, and I went as a punter to check the place out first - As it happens, the club suited me, so I went ahead and did it a couple of months later.
I know exactly what you are saying - when I say 'research', I don't by any means expect someone to change their individual style to suit the club they have been asked to D.J at - That would be D.Jing just to be a D.J (Surely that 'Malarkey' doesn't go on does it? )
....That would be akin to me D.Jing at Burnley, then Danny D.Jing at a 'Midtempo Night' - We both may well 'scrape' through, but what would be the point when others would 'fit the bill' so much better?
All the best,
Len