Hehe I guess I'm some kind of signature addict. I do like sigs for a simple psychological reason: It'll tell you something about the person itself.
I guess each and everyone forms his or her opinion about the persons who post in this forums. You're reading a thread, post by post, and besides the information transferred through the post's content, you almost immediatly form an opinion about the author or adapt it for already known authors.
The signature is the spot where the author of the post at hand is able to present just about anything he/she likes to. For example if he/she has a quote in his/her sig it's most probably one which he/she finds funny, interesting or this quote might even sum up his/her ideas or attitude of life....
So it's actually telling you quite a bit about this person already.
Even if he/she just enumerates his/her HiFi possessions it'll tell you something, besides the contents, through the way it is presented.
I like to think of a signature (incl. the avatar) as the virtual "clothes" of the member, his/her outer apperance on the forum. Just as much as the outer appearance might tell you something about persons in real life it may tell you here on the forum.
I hear people screaming that it won't tell you anything if everythings just a fake. Nope, even in that situation it'll tell you something about that person!
You'll most likely find out about its wholeheartedness soon enough through the members posts.
Ah, I want more sigs! No sig also tells alot hehe.
Ciao,
Marcus