If anyone has access to Simon A Bennett's research paper "Flight crew stress and fatigue in low-cost commercial operations - an appraisal" where he looks at the low cost model of uk airlines he makes a finding in his conlusions that a 100% increase in flight crew cost will amount to an increase of just 4% on the ticket price.
If anyone is able to get hold of it and read it for themselves then it would no doubt be an eye opener on many issues, notibly on the issue of pay! Good luck to you all.