The machines likely have a several months to a year+ time needed to ROI assuming they neither pay nor receive rent. The ATM mentioned in the OP would make ~3,200 per month in revenue assuming they charge a 5% fee, although I am not sure how realistic this would be as I am not sure what the average fees for BTC ATMS are.

The ATM in the OP also has caused additional foot traffic into the restaurant that it is housed in so it would not be out of the question if the owner of the restaurant actually paid the BTC ATM operator to have their ATM there as it would likely increase sales.