I scratch my head over this. I'm not a trader or gambler but a reasonably intelligent investor. I have a modest balanced self-directed portfolio invested in Canadian stocks.  I put in a lot of time up front researching but now do very little except keep an eye on it. 
I set a target of 14% p.a. growth, which I thought aggressive when I started up 11 months ago. I am up 53% to date.  Even if the market dropped 25% tomorrow, I'd still be ahead of target.
Okay, I admit I've been lucky (though I've also done some dumb things) but if someone came to me and said, "Guess what, I'm an expert and made 6.8% on your money last year and I'm only keeping 22% of it," I wouldn't see any cause to rejoice.