The problem is that the organisers end their activities with the upload of hundreds of images. The cleanup is expected to be done by un-named, unknown others. The encyclopedic value of the images that the people took in the photothon never get realised.
The organisers of any photothon must realise that the photothon should end only after the Juice is squeezed out of each image. Better to have 50 good images, catalogued and embellishing articles than thousands "[[waiting for Godot]]".