From an article in the Billboard Feb 22, 1947:
In 1947 it cost $100 per year per machine for an operator to get a pinball license. Running that through an inflation calculator, that's $1,060.98 in today's dollars!
Toledo had 1100 licensed pinball machines throughout the city (and likely quite a few more underground) with an approximate population of 290,000. That's about twice as many machines as in the entire greater CA Bay Area today, which includes over 60 cities and a population of over 6 million. That's about forty times more pinball games per person.