It is a task just to keep things straight. The PM's, the receiving, emails being sent to a spam folder, resizing most of the images, setting up the thread with a poll and 20 images and pray to god you haven't left anyone out. Check, check, recheck. Email issues.... I actually had to call someone about their submission.
I can't imagine doing this at twice the size.
If you've ever hosted, you'd agree that anything above 25 would be too much to handle