It's only happened to us once in reverse when someone landed at our airfield with a problem. He got help and no charge. We don't charge any arrivals actually, we just ask for a charitable donation, but our costs are quite low and covered by the resident's fees and so we don't need the income.
I think it is commendable that you did not charge and the same could be said of the airfield you are talking about if they had done the same - but just because you do things one way does not mean you should
expect others to do the same!