As a former park manager and employee for Cedar Fair and Premier parks. Enthusiasts are best for generating interest in their parks and Rides. As an employee their excitement can be energizing and really make your day. Yet large groups can disrupt the flow and expect VIP treatment, more than you can provide. That is the main reason why they like to have coaster events; keep the enthusiasts contained, controlled and content. As a manager the park has a vision and they may get some feedback from you but ideally when selecting a new attraction it is a very complex process. Permits, bids, deadlines, surveys, statistics: all investment in the parks future. What they are planning now you will not see for maybe five years. A park needs on going public excitement if it is going to survive.