I disagree that competition is bad. It drives you to work harder and innovate more.
I doubt the NFL allows jerseys to be sold at anything other than a standard price and likely don't allow discounts.
The stadium seats 65k, let's say, and the Chicago metro has about 10M people (
https://en.wikipedia.org/wiki/Chicago_metropolitan_area#Population). I have to imagine there are plenty of people who would love to buy Bears tickets, but can't because it's already full. Maybe on a waiting list. This would give then another chance to buy tickets to an NFL team, and would then in no way affect those already buying Bears tickets.