Unfortunately (or fortunately), the addresses in most people's signatures are just for the forums (mine is).  So, the only thing you see in the blockchain is how much I've receive TO THAT ADDRESS.  It has ZERO bearing on my total BTC wealth (or lack thereof), unless I then move everything to a central location (which I don't). 

I use, and most people do, separate addresses for each mining pool, each forum, and each transaction.