Flydive,
I get the impression that you instruct part time: I think this is the key:yes the pay is poor and will never get better, but if you enjoy it and it is only a side line to your normal occupation then it is a way of getting free flying.
I instructed full time for three years and at the end was tearing my hair out:my flying had long since peaked and started to deteriorate, I had a low level of patience with students, all in all I had a bad case of instructor burn out:I would never recommend anyone doing it full time unless they need the hours prior to going commercial:there is just too much repetition for it to stay enjoyable.
Now I am back doing it and a few days a week is just staying enjoyable, but i shall not be renewing the rating next time.