Well, that is the question. Does it fall into the amusement ride category?
I can understand amusement rides are excluded form paying royalty fees because they cost a lot of investment and a big part of the ticket for the ride is needed to cover the investments.
For the thing I have in mind I also need to invest in room and equipment etc (off course not as much as a roller coaster). So I could imagine it is royalty free. But I would like to be sure about this.