https://www.propublica.org/article/illinois-video-gambling-w...
These are interesting reads regarding slot parlors in Illinois. It gets repeated in every locale that legalizes slots. Big promises of increased tax revenues, then the actuals are 10%-30% of the forecasts, but by then the horse is already out of the barn. I've looked at a few state level gaming commission data sets and backed out the math, and even in backwoods areas, penny slot machines generate $20/hr average ($240/day) in gross income (even though they're called penny slots, you can easily lose $20 in under 60 seconds based on speed of play, number of lines and bet sizing-- all of which are heavily optimized to trigger reward centers in the brain), so even with expensive $5-10k machines, the recovery time is pretty low, so they'll just metastasize as much as legally allowed.
I find it pretty sad as there is no glamor at all in dunking dollars into bad slot machines at a shell station. But I didn’t find the scratch off tickets they sold at the counter glamorous either.