Yes, it is all a risk, thus all a gamble in essence! Diversification is no more of an "investment" then. It is just a safer bet. We are simply comparing focused gambling vs. diversified gambling!
Over the life of this board we've watched a number of posters share their portfolio compositions. I have no idea how many "Hi, I am..." threads I've read over the last seven years but I'd safely say it's over a thousand.
The portfolios that are diversified among the typical asset classes are pretty boring. Nobody gets excited about them. They mostly go up. Sometimes they go down. People retire on those portfolios anyway and they appear to live happily despite the lack of excitement.
Every hundred posters or so, one comes along who's figured it all out. It doesn't matter what the assets are-- stocks, options, commodities, AI trading programs, even online poker. They're sure that this time they have it right, whatever "right" may be. They know the industry, they work for the company, they trust the execs, they've backtested all the way to the 1700s, they personally did the programming. They have the edge. Everyone else's concerns & comments are appreciated but [-]ignored[/-] unenlightened, scared, or just plain boring.
The only thing those posters' portfolios had in common was a lack of diversification. You can probably see where I'm going with this.
We talk about the risks, but no one listens. They're in a hurry to get to ER, they know there's plenty of upside, they'd have to pay a big tax bill, "just one more year", they're absolutely positive that they're being compensated for their risk (so far!), ad [-]nauseum[/-] infinitum. Sometimes they're polite about it, sometimes they're defensive, sometimes they're downright hostile & rude. But mostly they're serenely amused at our inability to "get it" about this diversification thing.
Then a black swan swoops down onto their portfolio. With a bad case of diarrhea.
So although I'm preachin' to your choir, I'll mention for the benefit of the other posters the names Poyet, VaCollector, Dixonge (who BTW has a most excellent blog going on his post-options travels) and... I'm sure there are one or two others who have hands-on diversification experience to share with the class.
Brewer's been on the stage or in the wings of some of the decade's most spectacular financial flameouts. Right now he's being so polite that it hurts to read his posts. If he thinks you should be buying puts then you should be buying long-dated ones to hedge most of your portfolio, and you should be buying new ones as they expire. Go [-]cheap[/-] OTM 10%-15% if you're serenely confident of your market perception, but pay the insurance premiums now.
Or, as he said, you could always use the "Good luck with that" strategy.