Traffic Flow SEO

Have you ever been in your favorite forum and noticed people selling the signature links at the bottom of their posts? One of my favorite forums is Digital Point and I have seen many people sell one or more of their signatures links (Digital Point allows up to four) to make a little extra money. I guess I never realized that there was such an organized approach to selling signature links until I found the forum to end all signature link forums - Sig-Link. Check it out and see what your posts are worth....:-)