Why not compare pilot and cabin crew costs??
BA pilots have among the best pay and conditions in the industry but when you factor in the time to command, I suspect the career earnings of a BA pilot and a LoCo pilot who picks up a command at 3/4/5 thousand hours are at least in the same ballpark.
In brief, and even without factoring in the long time to command, BA pilots are not paid twice or three times as much as their counterparts in other airlines. BA cabin crew are.
I can understand BA management's need to address this fact.