You might argue that the favourable availability is a by product of the ruinous surcharges

Having booked an EDI-SFO (T class/MFU) yesterday for March, even I was taken aback by the difference in fuel surcharges between WT+ and Club - the uplift was approx £30 per TATL sector. Anyway, since pressing the button on this trip and now having reviewed my booking, I am aghast to discover this trip will actually earn more BA Miles than I spent on the MFU.

Swings and roundabouts