Obviously there's a bit of fighting going on between the two sides on screenshot size and how many can be posted. So I'm going to suggest a few ways to make both sides happy.

1. I know there are some vBulletin scripts that can auto-resize images.

2. There is an alternative spoiler tag for vBulletin that works like this.




Users can also give a reason for the tag (e.g. For size/number).

3. Implement Lightbox:
http://www.lokeshdhakar.com/projects/lightbox2/