Smart vending machines make more money than traditional vending machines.
Smart vending machines have a higher average sale because they take more types of payments, they attract more attention because they have large format display screens that garner notice and you can generate advertising revenue by selling ad space to other businesses on your display screen.
Smart vending machines are also more operationally efficient. Keeping oversight of hardware, products and processes ensure higher revenue potential.
We have a great blog post here that shows the ROI of smart vending machines.