Assuming they would get an average gate of 25,000 if their prices were value for money like ours. Then assume they will have about 15,000 season ticket holders.
That means 10,000 would pay on the day. For simplicity let's assume all 10,000 paid 29. That's 290,000 gate receipts for a 25,000 crowd.
Now assume it's 46 a ticket and as a result a third of the 10,000 walk up supporters decide not to go. That's still 303,600 gate receipts but for a 21,600 crowd.
If their gates dropped to anymore than 1/3rd, then his plan back fires. For example if 40 percent decide not to turn up (a 21,000 gate) then he would lose out as the revenue from casual ticket sales would be 276,000, less than the 290,000 in the first scenario.
Upshot is, he's risked pissing off and alienating a whole load of piggies on what looks like, on Excel, to be a very risky strategy. If they set the division alight, then it will probably work out for him. But if they have a faltering start (and bear in mind their new manager doesn't really have glowing record) then they'll be in the shit.