I have this with pc's too.

it got worse and worse that I was spending 2 nights a week with "friends" working on pc's for free.
I just said i wouldn't do it anymore.

A good mate asked if I would do it for his business, and offered to pay me an hour, we agreed. Worked 5 hours a couple of weeks ago, still didn't see any money

Got a txt from someone if I could have a look at their pc, even didn't reply on it, fuck them all. I have better things to do in my spare time.