There's a price point that most NFL teams can't go past without risking a fan rebellion, and I doubt the Green Bay Packers are anywhere close to it. This is basically a 5% price hike. What would it take for Packer fans to complain? 10%? 20%?
It's really expensive to go to an NFL game, but I doubt a $3 to $5 ticket price increase will be the tipping point for most people who travel to Lambeau. If you want a game ticket that costs next to nothing, there's always the NBA.