I have to say my last three underpriced, time consuming customers are elderly people in their 90's. One is a 99 year old lady who was a radar operator in the RAF during WW2 and her disabled 75 year old son.
The others are a pair of 90 year olds and the husband is losing his marbles, also a couple where the husband is dying and the wife half blind.
I haven't the heart to dump them or put their prices up. I've done them all since my ladder days. But nature will take care of it in the next year or so.