What does referee history has to do with how the outcome of a match would be? This is not one of the things that I can possibly think of while analyzing a match to bet on.
Exactly what I was about to ask, I've never and can never think of the history of the referee when considering my pick on a particular game but I think it's a unique thing to look out for.
Who knows if a referee has a deeper relationship with other club owner or possibly has an affair with some players on the other side too, a bias attitude may arise.
People now bet on cards. Maybe studying the referee who issues these cards would help them make better choices in card betting. We can't really tell what he needs that knowledge for; but no knowledge is truly a waste. Unfortunately, in gambling, your knowledge doesn't guarantee anything, just be a responsible gambler.