I think that's because images are the easiest way to get points. You guys MUST find someway to automatically check for dupes or something. Robots are the answer!

Robots with giant clown shoes he means, they work extra hard. That, or just up the number of people approving stuff.

you should take a nap

I'd help out if I had more time.  Giving points for moderating would probably decrease the queue size, but I understand why there would be hesitation to do so.