Each resignee has his/her own reasons for leaving.
But if you look at the resignation rate of A scale against B scale you will see a much higher percentage of resignations in the latter. I would suggest a B scale resignation rate of around 1500% greater than A scale (15-1).
So, if the companies do wish to reduce their crew losses then all they have to do is pay. That will also attract more experienced crews to apply for vacancies so that crewing numbers can be incresed, and we can all get that long sought Rostering Agreement.
Only then will all be fixed.
Cheers
Drunkenair (hic)