Simple. From his bio on his website where he sells prints:

"Currently, I am working as Creative Director for a promotion agency, designing premiums for McDonald's."

I'd be surprised if this doesn't pay several multiples per hour of time for what he could have earned at Capcom, adjusted for inflation. Work for, say, Stern or JJP, would likely be much less lucrative than his time at Capcom.

He's probably better off selling prints and sketches re: pinball. Don't take much time, probably offer a reasonable return, and allow him to scratch an itch.

Working on playfield, cabinet, plastics, bg, and potentially animations and display graphics would be hugely time consuming and miles below his pay grade, these days.