First responding to
matthew
It is true, you can do those things, and get traffic to your site. But when you pay for traffic with something like a PPC service(NO link exchanges = SE no no ), you can get targeted hits to your site, and based on the general aspect of cost of the ad vs a normal sale, the traffic can be worth the money.
christopher
As soon as people started realizing that their sig links help to backlink counts and the such, people put the link in their sig. I actually click sig links a few times a sitting when roaming the forums. But to agree with you, most are not intresting.
A small aspect that make the sig link more click-able for me, is a description of what the link is (other than the direct keywords in the link). If someone give me a short description that catches my eye, I am more apt to look at it.
I can see both sides though.
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