I have a pretty dark site. I think (not sure) a lot of these peole have invested very large sums into their rig with the scope, mount, camera and such and to them they want to see what it can do and don't live in the right spot for certain things. I know there's a huge industry of going observing and doing astrophotography in the southern hemishere to get new things.
But pretty sure it's more about the investment into the rig over long periods. Maybe it's just me. The amount did not seem that high considering the multi multi thousands each rig cost.