I help friends and family for free. I also help some relatives and co-employers privately, but for them I charge money. And by word of mouth I've gotten more "customers", but I'm backing out of it now. Not because I don't like helping, or because of the money, but because some people seem to think that I'm always available.
They call me desperately again and again and again instead of leaving a message and wait until I have the time to answer. They call me or disturb me with their private computer problems at work. I've even have some people sending me text-messages in the middle of the night with their PC-problems (Mostly it is not the computer that's the problem).
I have a hard time figuring out how these people, that otherwise seem like friendly and kind, can suddenly be so desperate and rude when their PC is broke, or they cannot figure out how to use it. I spend way too much time ignoring desperate calls, and then sometimes giving in and help even though I should be doing something else.
My advise to anyone considering going into this business: Help your closest friends and family, but say no to anyone else - they can use one of the many PC-repair shops that exists.