If you take yourself seriously (meaning that everything people might tell you can either bring GREAT JOY or commit suicide) don't sign up. If you wanna hear what other guitarists want to say about your thing, then sign up...
I'm a freakin pro, and I only have a 42% of wins!! Sometimes, it was totally justified, sometimes, people just didn't hook up with my stuff. But who cares right? I have fun...