Indeed, well done for stating the obvious .....
In a Capitalist economy, "fair" [unfortunately] doesn't come in to it. Anything that has a finite supply and high demand will be expensive, housing and gold are two obvious examples.
And whilst Notters hates the laws of economics, unfortunately...
But this is very simple supply & demand, price controlled economics.
There are a finite number of available tickets [scarce resource], so the price for this is controlled by demand aka demand dictates the price. If the capacity is 30k and 31k want a ticket, price will be high.
If it were truly...