If his first priority is making a living or securing his future, then love for the hobby should take a backseat anyway.
As far as spoiling Pinball, the people I know that felt this way didn't go all in - they started a side hustle and kept their day job. Too much sweat, not enough reward.
It is very liberating to go all in. I did a lot of planning and research before I jumped and that paid off. I also didn't do it 'for the love of pinball, ' I did it to build a real business and make real money. A year later I'm looking to expand in the middle of a recession.
I had real expectations and goals, not (just) that romantic pinball dream that almost all of us have had at least once.
Although I don't play as much pinball today as I used to, I still love it.
As far as the interview, GL. With your experience in your own business, you should be interviewing them. Since you will be working for someone else for the first time, you are going to really need to like the people and team you will see everyday. You can and should be very selective.