Originally Posted by G-BOAG
... Because the passenger across the aisle that paid 8000GBP would not do so if he/she could purchase the same seat for a fraction of the full-fare and pay a 50GBP/75GBP/100GBP fee to change.
It makes sense. Discount fares come at a price.
A full plane does not mean it is going to be a profitable flight.
The most expensive fare that BA has from to London to Grand Cayman in Club is 3400GBP. I do not see how the passenger across the aisle could have have paid 8000GBP (unless he was being very generous to BA)