Forums can be used in a couple of ways to get sigs:
1. In posts (check forum rules)2. In signitures (check forum rules)
3. In user/member profiles (check forum rules)
Instead of paying for a few high PR links each month to create profiles, which are shared by over 1000 other people, take a minute and come up with your own list...Refer to the PR Checker thread for ways to gather PageRank info.
"Powered by vBulletin" + your keywords
"Powered by phpBB" + your keywords
"Invision Power Board" your keywords
"Powered by WowBB" + your keywords
"Powered by SMF" + your keywords