I own three website and 100% of the traffic generated is from Signature Links! I have noticed that the more detailed and informative your replies and posts are the more traffic you will also generate. Simply just saying, "Yeah Signature links work" will not get you any traffic. Sometimes this method does but you better have a catchy siglink! I also suggest NOT adding text before your signatures like the poster above me. Please don't take offense! I'm only saying this for your benefit. Make your text a clickable link like mine and you will get far better results. I honestly see the above siglink as an unorganized signature, and I'm not clicking it. Almost like it's information over load in some sense. I have written many blogs regarding successful signatures sales but they are all mainly for an auction and not regarding the topic so much. In the end I only suggest 1 thing, well maybe two aside for everything else. Make the wording short and descriptive as possible.

Best of luck