Post: Improving Your Search Engine Ranking
Infraction: Links in posts
Confine links to signatures only
Message to User:
Avoid Links in posts and use signatures for links to your site.
If you want to improve your Search Engine Ranking you must use vbulletin .We should not need to hack vBulletin to search engine optimise it, we should only have to work on the onpage words, but yes, php mods and template changes are needed for search engine optimizations of vBulletin forums.