I think that what many of you said is true about how payment is made. Many of us just do the old country way of compensation. We either repay each other with companionship, or we invite the instructor and his wife to dinner, or we give them a motor, or we help them re-roof their house or fix their car. I think there is a lot a repayment that goes on in this hobby other that just writing a check.
An instructor at my club who may expect a few dollars for instruction may find himself invited over for Aunt Bea's potroast and apple pie instead.