Hi Traditional Bill -
I am sorry you were disappointed with the size of the crowd, but as one of the event organizers, I can assure you the event achieved "mega" status. As others have pointed out, we had around 525 signatures at GCDART. Thank you for being one of the 525! We carefully scrubbed the logs to remove duplicates and improper entries, reviewed these with the GS lackey who attended the event, and submitted the logs to Groundspeak, who certified it as a mega event. The following years, we had even more attendees than the first mega.
But while the event met the qualifications for a mega, I can understand why it might appear to be smaller than it actually was. First, it is held in a HUGE 8,000 park, one of the largest municipal parks east of the Mississippi. The park is home to nearly 50 geocaches, with many more in the immediate vicinity. It has a campground, extensive hiking and biking trails, boat and bike rentals, and a golf course. There is a lot to do, and people tend to spread out, so you may not see everyone at the same time.
I hope you will have the opportunity to come back soon, and we are always welcome to new ideas and suggestions for improvement.