They don't expect "normal folks" to pay that much. Or maybe one can say, "they don't care who is buying the tickets and what their economic status is."
The NFL and other Sports leagues are Big Businesses. They charge what the market will bare. Given that the waiting list for Packer season tickets is longer than most of us will care to wait (30-40 years), the Packers could probably bump ticket prices up 25% or more and still sell out every game.
What I was a bit surprised to find, if these stats are correct, the Packers now have the 4th highest average ticket price in the NFL. I always thought they were in the middle tier.
https://www.statista.com/statistics/193595/average-ticket-price-in-the-nfl-by-team/
They could, for a while. It's starting to show though. MANY people sell their tickets. Many more opposing fans come, because it's lambeau, but in time that will diminish with rising costs. It is slowly changing the complexity and make up of the stadium experience. A lot of people are selling more tickets than they use and more are finding it more difficult to sell those tickets even at face value anymore.
The fans are what made the stadium and legend grow with the team. replace them with too many of something else and that experience goes away, coupled with less people wanting to do it anyway because of cost.
The NFL could be a cash cow for a long, long, long time and many people will have rich experiences and grow the game and the players, owners, cities will continue to reap the rewards of this? Or they can maximize it all for profit now, and live with the results. It all plays a role, exclusive TV rights decreases viewership, increase ticket costs keep dedicated fans and more importantly, their next generation of fans out. Change the experience, will people continue to pay for the experience?
Lambeau field is changing, they need to be aware of this. I think they're getting into some dangerous territory.
... they lose when I'm there. 
A victory means more to me than seeing a game in person.
