> They also need higher profit margins to make back the installation and maintenance cost depending on utilization rates they expect, otherwise installing these chargers doesn't make a lot of sense for businesses.

While I respect the right of the business to make its own decisions about what the payback time ought to be, I'd also guess that other than replacing the very cheap jack/socket and the payment tablet, these devices will last decades. The only reason they need high profit margins is a desire for a short payback time, much, much shorter than the likely life of the device.