Originally Posted by
rhegedus
Seems odd though.
There's the guarantee of money up-front now not maybe in nine months time.
BA wouldn't be losing money on it.
In addition to possibly being able to sell the F ticket the day before as noted by mikeyfly, they still might be able to sell the F ticket for the next 8+ months at the advance purchase F price; then if not successful they can still offer an AUP the day of departure.