Why is it that whenever someone has something rare and doesn't instantly make it available to everyone for free, they're pilloried as greedy hoarders? It'd be a shame if this degenerates into another flame thread, so I think this should be nipped in the bud right now.

I don't think they are holding it back for reasons of profit. If I had to guess, perhaps they and their source are worried about possible legal repercussions from Lucasfilm if they release it. The copyright notice at the end is to LFL. Knowing about how they've repossessed "stolen" film prints, it's probably wiser not to take chances.