Football is king. It's in March/April, the saddest time of life for a football fan. You try to read anything you can on the team, which isn't much. The weather is comparable to what you'll find in September, early October. It's a perfect storm.
As it is, my priority is always the weekend series, and if I miss the spring game, so what. But, if the weekend was centered totally around the team, with an opportunity to see things that you normally don't (locker rooms, suites, club level, M-Club, etc.), it could be a great revenue generator.
If you had enough to do, and it was orchestrated right, I would pay $10+ for the Spring game and it's activities. On a baseball weekend, probably not.