Sadly, most of us have our lives ruled by nasty, small-minded people called "accountants", whose world view tends to be exceedingly hostile to anything that increases costs even a little, and to whom the prospect of cutting travel costs significantly by sacrificing a little flexibility is heaven on a plate!

As well, I am sure that QF have done their sums fairly accurately on the likely impact of the domestic fare restucture, and have concluded that the increased SC levels won't actually cost them anything in nett terms at the end of the day..I very much doubt they would be doing it otherwise!