I was on the Board of the band I was in for a while. I learned that it takes quite a bit of money to keep a brass band afloat. A big part of our budget came from concert series ticket sales. (We were fortunate that we didn't have to pay for our rehearsal space, or it would have been much worse.) And the general public will only pay to attend if they are entertained, of course. So you have to program things the audience likes. Our director did a pretty good job of mixing in more "artistic" selections with the drivel.