In addition, the FAQ section explain it as part of the rules: http://forums.digitalpoint.com/faq.php?faq=signatures#faq_signature_requirements
This is one reason DP is so quick and fast and easy to browse, because there are no images enabled in Sigs. IT
never shd allow that, would take hell of time to load pages and probably everyone would end up blockin images and participate in the board
Lol i never even knew that Better than on another game I play where Flash is allowed in sigs :/ the forums lag like a bitch