As I understand it, the reason the NFL has a minimum stadium size that they will approve is largely due to their comprehensive revenue sharing.....they want to make sure that all teams are contributing to the revenue pool on a +/- "fair" basis.
One of the goals, I believe, of the much maligned Rogers series ticket prices was to show the league that Toronto could support/absorb much higher ticket prices and that by charging those huge prices, the revenue generated by the smaller than league requirement Rogers Centre per game could exceed the revenues in much larger venues.
The hope was that a future bid for a NFL team would not be hampered by the smaller capacity of the stadium. With 55k (+/-) and a disproportionate amount of private boxes, game day revenue would be sufficient to allow a Toronto team to be a positive contribution to the revenue sharing pool and a Toronto team is feasible in a smaller venue.
It was not, just, a plan to gouge Toronto sports fans. It was, however, a plan that did not work.