Remember the hopes we all had that the sport was taking a turn to the big leagues when they built this track? Stadium style seating, massive tower and grandstands- if they build it, the crowds will follow, blah blah blah...
At this point in the association needs to sit down with ALL the tracks on the tour and say "Look, we know your average attendance numbers, and you are making us look bad with all these seats masquerading as attendees. Mask off, or even remove some of that grandstand area, sell tickets to FILL the rest of them, and stop making it look like we are half empty on television."
Concerts I do in larger venues that are poorly sold will close and in some cases, curtain off the upper balcony and renumber the seats down low to make the place look full, even when not.