Yes expansion is one reason for the constant employment that takes place at QR but so is the rate at which people leave (or get unfairly fired).
If its such a great place for a career why do so many leave or of those still there why do so many want to get out?
Unfortunately most that join now are because there are no other options. Some have been unfortunate to have been left high n dry by Duo so any job is better than none. Others are ex SQ that got released suring SARs etc etc.
People with QR are just passing through - not that many are seriously considering it a career move - are they???
The company fail to encourage staff to pursue a career by making very little contribution to personal developement - staff 'getting on' is considered a threat to those treading water above them - hence no motivation to develop them....sad for such a young expanding airline that desperately needs a backbone of decent management to fulfill its plans...