FWIW I do not nor have I ever received any personal payment for teaching aikido, though I have on a number of occasions paid out of my own pocket when we couldn't manage the bills, effectively paying money in order to teach others. I doubt I'm the only one to have done this sort of thing either.
I reckon I was out of pocket most of the first two years of trying to establish a dojo, it was a price I was willing to pay.
Most of the fees quoted here seem affordable. I guess that many teachers teach, not for any monetary gain, but for the love of passing on an art that they know and love.
I charge about £2 an hour, less for unwaged, kids, etc. we cover the costs of the hall/mat, and the occasional petrol bill for me up to HQ.
The riches I have gained from aikido are immeasurable, but not in terms of money