We have 5 season tickets and our 3 kids LOVE coming to the games with us. We basically just view the cost of the season tickets as one of our annual family vacations. (A vacation which just happens to be spread over the football season instead of just a quick week to a vacation spot). Every game day we try to stay the night at a hotel in Provo. This is mostly for fun, but it is particularly helpful on late Thursday or Friday games. I am typically out around one or two vacation days to pull it off, but again, when viewing it as a vacation, it really isn't that bad.
I love the fact that my 8 year old can name nearly every starter on the team, offense and defense... Money well spent ; )