Probably has something to do with all the western pilots bailing en-mass every year because of the poor pay for them, and home sickness
I will take out your first word "probably" and put insted something more affermative.
if you're bonded they take out 1k from your salary and you get a Mc donald salary and if not bonded you doing 90 hours on a jet aircraft earning if you re lucky something like 3k...well, counting that you 're a pilot, transporting 180 people and leaving abroad(even if sometimes in some cheap country) still need to pay for your own accomodation and tickets to fly back home whenever you want....
not good conditions perhaps!
So the decision, after lot of western people left them with no prior notice, to get easter people more!