The more people who add a link to their signature the quicker the concept of reputations will spread. Likewise I see no harm in asking a member who is clearly happy with the help you have given them to give a little back by adding to your reputation, it doesn't cost them money and I doubt it takes more than 20 seconds.

I've posted code here to add to signatures:

http://www.vbforums.com/showthread.php?t=321430