I came across this article, it’s a little outdated, September 2014, but still amazing read on a successful NYC based photobooth company that made $7 million in 2014. Charging clients for custom events anywhere from $40k to $120k per event.
http://www.forbes.com/sites/natalierobehmed/2014/09/22/the-bosco-the-photobooth-company-making-a-mint-from-party-pictures/