Reason for Blocking Images to people without accounts?

I’m curious why images in non-gallery threads uploaded through the blenderartists system are password protected to not logged in users? It would be nice to change this. I often share threads with people who are involved in graphics, but not part of the blender community and it would be nice if they could see my images.

Bandwidth, maybe?

This is the same across a lot of vBulletin forums.

You can host your finished project images on an external site.