Hi Frank
Events Booking allows users to submit events from frontend of your site. However, there is not a way to allow site owner to get free per registrant yet. It is quite difficult because;
1. Not many payment gateways allow splitting a transaction into two smaller transactions (one to event owner and one to the registrant)
2. Even if the payment gateway allows that, I am not sure if the registrants happy to see two transactions for their registration as above
In short, this feature is not supported at the moment and there is no an easy way to handle it
Tuan