What I feel that signature link do have importance however doesn't effect your SEO work. Because most of the time Signature link from forum do not counted by searchg engines. Also NOFOLLOW is another factor to consider.
Though it's very important. How...
A regular member of any forum who posts consistently can create an identity for him or her. Sometimes people love to listen from them. That creates a good image for your site. Your spread of knowledge will attract people to see your site. That can help in viral marketing. May be first six month you may not get any positive results, but once you will start gaining positive response it will generate cumulative results giving you immense traffic.
If you are a new member you can ask questions to experts giving your site link as your signature link. Experts will definitely review it. At least once.
So dear forget about gaining back links, seo for a while and think about your visitors that how you can make them satisfied and use forum as a global platform for indirect marketing.
Am I right guys?
