You make an extremely valid point, I probably should have clarified what I said.
When I sit with my dad at games in Section 5 (behind opponents bench) I am sitting the majority of the time. He has a bad back, hip, foot, etc so he only stands when we go on a run, make a big shot, etc. I get irritated when the team CLEARLY needs a crowd boost and I (or anyone else) stands up and tries to pump up the section that they are in and the people behind them just sit there and look at you like you are committing a crime.
I do think that the two sections in each end zone should have a note regarding standing. Those seats are a combination of students, general admission, and people who bought tickets elsewhere, but found an open spot in that area.