Granted almost half the time I've posted images it has been to troll or make fun of something, but the other half have been screenshots, charts, and legitimate on-topic images.

These forums don't need to become 4chan just to allow photos, and what kind of an admin can't restrict sizes?

I say we charge for photos and that will shut everyone up.

Want an avatar? Pay a one time fee of 2BTC.
Want a signature? Pay a one time fee of 2BTC.

Disabling features doesn't keep people from anything but productive communication. Try limiting who posts them instead.