To be fair, GP said that FIFA is corrupt, not that FIFA is either profit-maximizing nor out to light the goose that lays the golden egg on fire.

I know it's hard to imagine in the US, what with our quarterly-profit-maximizing corruption, but it is possible to be corrupt and still have to balance long-term concerns like "keep the graft flowing".

The trick to getting away with being corrupt is to as corrupt as you can without your marks/customers/voters/whatever revolting¹. Switching ticket sales to an auction format would likely add enough friction that many people² wouldn't bother, bringing the price back down, or would make a very public noise about how unfair it feels.

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[1] or authorities taking action, but that usually comes after the marks/customers/voters/whatever speaking up loud enough, unless by “taking action” you mean “taking a piece of the action” by way of being corruptible themselves.

[2] from those who do, or might in future, play along with the current race-to-buy-at-fixed-teered-rates system.

To be fair, most of the scalpers are FIFA.