I built the inital version for my own university project. Now, after a few years I got it out of the drawer, adapted it and now it is publicly available. It was mainly built for events.
Part of the university project was to make a quantitative survey, ask the staff of events what they need, ask the customers what they need. Then I built the application and made an event to test it. This enabled me to collect a little feedback.
From my survey I know that organizers pay more than $ 200 for a order management system (e. g. about $ 300 for the system and more per device needed).
Until now only leisure clubs used it for events.