Even $75 an hour isn't cheap.
That's $600 a day or $3,000 per week or $156,000 per annum.
No wonder people are giving up their day jobs. Lol
As long as the person doing the pinball work is fast at diagnosing and fast at fixing, $50 an hour cash sounds better but if u can get more than that, well done.
Pinballs have become a nice and unique money earner to a small amount of those with the experience.