Same principle as in Consult with happy people.
If someone is a failure, you may learn from him ways to fail. Given the ecology of advice, quesitons, etc. you cannot say I will just ocnsult about a part of life. You get the effect in the ways a failing person frames a questions, in the ideas he proposes, in the direcitons he moves your attention.
An opposite possibility is if you are a failure yourself, maybe the more relevant advice for you is that of weak and failing individuals.
I am not convinced in this. I beleive you should go for the smarter happier and more successful when needing advice.