This excellent article, which I found very convincing, was given to me by a very intelligent man who considers himself insane.  He may well be right, although the piece he recommended is well worth reading if you are considering a psychopharmaceutical cure for what ails ye.  

Or if you are a psychiatrist who spends hours talking to patients, while wondering how to make more money in less time, with far fewer head aches.

The second part of the fascinating two part book review is here.