It's about making a statement. We all know Ashley hates being embarrassed. A club that is known for its large attendance's suddenly drops to 20k will generate press coverage and people will ask why. This may lead to more scrutiny?
It is literally the only thing we as fans can do and if you are unwilling to do it then you may as well be voting for the regime.
To be fair, Against Modern Football is more about the amount of money that is in the game at the moment and the disconnect from the fans and the clubs. The change from sports club to billion pound businesses.