It depends how you look at your small pay packet!
The instructors slice is a fairly large slice of a very small pie, I'm not condoning it just trying to justify it, it seems to boil down to the marketable price of a flying lesson, at any level of training, from the trial lesson/air experience flight through to commercial/IR training. If you work backwards from the retail price of any training flight the money is all spoken for. Insurance, capital investment/ finance, maintenance, lifed components, FUEL!, approvals/infrastructure etc.....
Engineers are in a similar position (albeit they can mend when the viz is 200m) the retail cost of aircraft maintenance/repair is low £30-£50/ hour retail the engineer/fitter again gets a fairly large slice of a small pie, anywhere from national minimum for a new starter to £20/hour for a licensed hard worker.....
The obvious answer would be to double the price of everything and we could all have a well deserved pay rise and do a lot less flying as another large amount of pilot training is lost to overseas providers!
Where’s that old bone dome.....