Selling cheaply!
Its called market forces and bums on pilots seats. If there is an oversupply of pilots the pay goes down quite simply because if there a two similalry qualified pilots, one who requires a salary of £60,000 whilst the other will work for £50,000 them which will the employer go for?
The playing field is never level however, with Ex BA pilots retiring at an early age with mega pensions and taking normal line jobs. It is alleged that some EX BA captains, (working for a LoCo up North) that their pension is larger than their LoCo salary.
Still you should never listen to rumours, OOps sorry this is a rumour network.