Disturbing as it is the actions taken by CASA can say only one thing, " they are incapable of regulating the Mustering Industry", why, well answer that for yourself.
Being unable to corectly regulate mustering is a load of toss, for commercial operations it is very simple, audit the company take a copy of all invoices and cross reference to the maintenance release and the trip logs ( as required in the industry exemption for mustering flight and duties), any glaring discrepancies, well we all know what happens then.
There is no way a commercial operator will muster 130 hours for jo farmer and only bill him 90 hours, ...so he can under write his hours.
I also feel for the CASA guys and girls at the cutting edge who have to deal with the now irrate operators.
how to regulate the private operators, well i have no idea.