I’m willing to bet a very small amount are in it for the commercials (there may be some that have realized that the world stops on that day and so they’ll join in for the commercials).
The majority are there for the game. That’s the substance.
No matter what amount of $ is spent, or how many dancers you throw on stage, the emotional content of the thing will remain with the game.
Here’s the very opposite of the superbowl halftime show…an improvised band in a small club setting with an audience sing a long…unfortunately, I’m the only one dancing.