I do believe there's something to the idea, but it doesn't follow that having a more clear mind leads to greater success in worldly terms.
I have noticed that it is the jolly, back-slapping networker who seems to pull off more work, drive the better car and be on more pleasant terms with his bank manager. Well, on the last point I'm just guessing. People, in general, seem to prefer the company of habitual laughers to that of sterner companions; as my late mothert-in-law was fond of saying: laugh and the world laughs with you, but cry and you cry alone. She was darn right.
For my part, I find the whole concept of the loud all-male bar group to be something I would avoid at all costs - I have managed to avoid it most of the time and don't feel I've missed a thing. But then, I have never sat through a reality tv show either...
But no, I don't bore myself at all; in fact, I have wonderful conversations with myself but with a major drawback: no conclusions ever get reached.
Maybe I need to get out more and laugh loudly at nothing.
;-(
Rob C