I am trying to calculate the profit contribution to QF of a single P1 member only. Wether or not a flight, route or airline makes a profit overall it is completely irrelevant to this calculation. It is like a mini profit and loss statement for them only. If QF sells only one seat on a flight but that seat is in full Y, the member is still highly profitable to QF but the flight itself is not.
For a single member, the net profit to QF after all costs associated to that single member only (and no one else) could be well in excess of 25%, and could approach 50%, of the revenue received from that single member if that member purchases corporate fully flexible fares.
I agree that P1 can be earned in the 20k-30k range. However, the vast majority of P1 will spend somewhere in the 50k-100k range and therefore the 25k profit estimate is valid as an overall average. Some will contribute far more and some far less.