I don't buy the argument that the airport was to blame. Has there been any discernible loss of custom from the increased prices? As far as I can see NCL Aero was in a dominant market position and for whatever reason didn't take advantage of that.
Whenever I was up there the booking sheets were full and I know that I had to book at least a week in advance to get an aircraft. Also there was nowhere else nearby that you could do your basic training. Yes £120 per hour or whatever it was is a lot of money but it is no different to what other schools charge around the country and many of those face stiff competition.
Consider a bit of basic 101 accounting.......If you charge say £100 plus a landing fee of £15 then surely it is basic budgeting to put aside the £15 as you know you have just collected it on behalf of someone else (ie Mr Parkin). Similarly you know that you have to pay 17.5% to HMC&E. It makes sound financial sense to put aside those monies into a separate account and of course from your detailed budgets you know that the remaining monies will cover your costs and hopefully deliver a bit of a surplus for the members for a rainy day. Me thinks that somewhere Peter robbed Paul which is how the wheels fell off but blame surely can't be placed with the airport.