people keep going on about variety! and why? to keep people interested of course! but there are other ways. changing the music every rehearsal etc. is just a way of stopping boredom. there are other ways, and while playing the same old stuff is boring, it can also be fun. for example, warming up with the same hymn every practice. boring, non? not necessarily! players not knowing what tempo it will be playe at both keeps them on their toes, is a good exercise, and because they know the piece, you can tell them they don't need to look etc. which is a good skill to learn for when you do test pieces.
I also know people who only come to band for the 'apres band' drink, but like fishta, I go for the music, and can't give anything less than 110%. At the moment, every breath is pain due to an injury, but it has and never will stop me from playing passacaglia (or any other piece), I enjoy banding such! but i'm lucky.