OK whoa whoa.
So you're saying Band students and their hard work exist solely for the entertainment of the football crowd?
I'd argue - staunchly so - against that notion.
In fact - my Athletic Director, and all of my school administration KNOW - that while I am a HIGHLY enthusiastic supporter of school spirit around the building... the Band's presence at halftime of a football game is 100% a dress rehearsal atmosphere for our competition show. We come over and play the Anthem pregame, then we play the school song after the coin toss and after each score. At the end of the first quarter, we leave to go do our competition warmup routine. We perform our show at halftime. Our student section and crowd - by and large - stay and watch the Band during halftime and cheer for our kids. More often than not, a large portion of the crowd leave after the Band performs - so many at times that the AD has gotten letters asking if he can somehow 'require' the crowd to stay and watch Q3 and Q4. And we have a decent (+.500ish) football team.
After halftime, we clear the field and my kids go back to the school and change out of uniform, after all, we have our REAL performance the next day and the kids don't need to be the last ones out of the school. If the kids want to go back to the game and sit in the student section, more power to them and I support that 100%. Oftentimes I will head back to the bleachers and sit and watch the rest of the game.
At basketball... the Band is ALWAYS present in full force - I make it a requirement for every student to be at games. We stay the whole game, and it is loud as hell in our gym. Teams HATE to come here because the Band is so into games. I love school spirit and I love my school.
I may be in a lucky situation, but at the same time, I have made it clear to everyone that my kids are given a Friday night showcase for THEIR hard work, talent, and dedication. They're going to go out and burn down their competition show. And we're going to be better at our real performance the next day because of it.
Why can't school spirit be... "Hey look, we have a freaking championship-calibur band!" At some places it is, and people are very proud of their competitive marching programs.