You have a great point; there were lots of kids there yesterday, which is a good thing for all. However, I disagree with your figure of $400+ for a regular season experience. I am a long-time season ticket holder. In 9 out of 10 years, I have a hard time even giving away non-conference tickets. No one wants to go through the hassle of driving to the area, parking ($10 at West Campus), and hoofing it to the game when they can sit in their living room and watch it on TV. How can a family have the experience of a home football game?
One: Pick a game where the opponent is out-of-state and non-B1G. (I'm talking directional Michigans or Troy.)
Two: if you can't find decently priced tickets in the usual secondary marketplaces prior to the game, just go to the Shoe 1 to 2 hours prior to kickoff. Scalpers get more desperate the closer to kickoff it gets. I've seen tickets go for as little as $10 each.
Three: Eat before you go. If it's hot out, you may want to have a $20 in your pocket for some bottled waters, but if your metabolism is such that you can't go four hours without eating, hide something (a bag of peanuts, perhaps) in your sock under your pants leg. It's how I get airplane bottles of my favorite spirits in.
It won't cost you much more than going to the movies, and it will be cheaper by far than Kings Island!