How fast such investment will be paid off. The ATM + shipping in sum give pretty high investment, especially for people with East Europe salaries, so how much profit the ATM may bring per month of expluatation?
Return of Investment (ROI) really depends on multiple factors. How high transaction fee will be? How many people will buy crypto? What is average transaction amount?
In brief I can tell you, that if you install Trovemat in crowded area with high density of crypto-aware people, ROI could be as low as 4 months.
You may also get a lot of traffic from coinmap.org if you list your Trovemat there.
Four months doesn't seem so much. In the situation of raising interest to crypto currencies I suppose such business can become really profitable. I need to make an analyze of my city and their crypto interests to see will it be successful or not.