If you are offering a high tech service, you should be compensated accordingly.
How much does electronic bench work typically cost these days? $75/Hr. $95/Hr. More?
How much does it cost for someone to show up and repair a washer, dryer, or Dishwasher? (which almost always requires a return trip)
How much do Computer Techs usually want just to simply restore your computer back to Factory install?
How much do A/C - Furnace repair techs get per hour.
And, like was mentioned, how much does the Auto Dealer get just to "diagnose" your car which typically entails plugging in a ODBII code reader?
IMO, if you are charging $50/Hr to work on a broken game, you are underselling your skills today. Granted, some owners can't afford more. And some games just aren't worth more. And certainly, we have seen some "Techs" aren't worth more. Obviously, some games require numerous hours of work to even get them functional, let alone, looking good (already discussed in another thread).
For those that Volunteer to help out a friend for less or for free, then that's a very noble cause. If you are trying to make a go of repairs as a main business, then you have to keep up with the times.