"Average" (of 23 survey respondents) might not be a particularly great measure. I can imagine many operators would have 1-3 machines on the premises of the business they are actually focused on (a pizza shop or an office cafeteria with a drink and a snacks vending machine), while others might have 75 or more.
(How much does the average mobile app make? Does that low 4-figure amount (edit-to-add: per year) mean that app development is a dead end?)
(How much does the average mobile app make? Does that low 4-figure amount (edit-to-add: per year) mean that app development is a dead end?)