HobieCat and NAHCA require Hobie only. I'd love to race my hobie 16 at a J 24 event - but they won't let me. Thus - the NOR for some events require hobie only.
Two points
What other national class attempts to control local clubs by telling them NOT to invite other classes? Your J24 example is a poor one. The local club is organizing the regatta and making choices that optimize the success of the event for the club and the participants.
Hobie Cat Corp pays money for these regattas and its appropriate for them to require restricted participation. Sort of like Budweiser beer buying the rights to the Super bowl and not allowing Coors to advertise.
