Remember that after the first round of 25% increases, the price continues to go up the higher of 2.5% or inflation.
So after 10 years of continuous 2.5% increases, (that is, the 11th or 12th year), they are up another 25%.
I didn't cover that case because it would take a spreadsheet to go over all of the possible scenarios.
And if you ignore the expense of repairs and actually running the thing, they can make trillions.