Just get rid of all sigs by ticking the box on your edit profile page. Much simpler
I like looking at peoples signatures though. I like reading their sometimes uneducated, most times thought out predictions for different games and systems. I like reading and viewing pictures about what games people are interested in so I know a little something about a person and their preferences without having to go to everyones profile. I like reading the funny remarks people make sometimes and the bets some have going on with others, as well as 'I can't believe someone said this! (link)'
If I turn them off, I don't see any of that.