I think its deeper than riding old attractions for some peeps. I imagine the peeps that would value being to drop into their next Disney conversation " we were there when the park was EMPTY", hoping to get called out for BS, and then have the photos to prove it? a photo, anywhere in the park, with no one else anywhere in said photo? The review I just read, indicated the Main Street Bus would carry you up and down Main Street all night...great YouTube opportunity! I have been trying forever to get that "perfect" photo of me in the Space Mountain Blue Strobe Tunnel...maybe ride it umpteen times in a row and finally accomplish the photo?
Didn't mean to ramble, but there has to be a crowd that has some warped psycho-value, other than just riding rides they have ridden in the past.
One other note... Thursday May 19th (the last scheduled event), is preceded by Wednesday May 18th, on which MK has EME til 1:00!