A truly insightful and thoughtful post, thank you!
In addition to recognizing the role of luck, there is another factor that can be decisive in concentration or otherwise. For most of us, the sources of information are secondary - i.e. from research reports, or via other media. It is only in very few companies that we get primary source of information, i.e. directly from the market, or via management. A platform like Valuepickr affords that source of primary information, for instance in case of Kaveri seeds, one knew exactly the usage on the ground ( hahaā¦literally !). Yet, there was a time when many members were caught with headlight in the eye when the Royalty issues exploded to compound poor monsoon.
So faith and conviction is all fine, but if that is based on secondary source of information, there is still lack of true insight into the company and nothing beats getting primary source of information - from the company, from competition, from vendors of the company, from customers of the company, the bankers, the employees. This is the Edge without which concentration can be highly risky, and one may even be unaware of carrying such a risk. As RD says, for every concentrated investor, there are many others that are successful being diversified. The stories we hear of successful concentrated investors might be the ones which carry Survivorship bias.
Howard Marks sums it up best:
Investors who feel they know what the future holds, will act assertively: making directional bets, concentrating positions, levering holdings and counting on future growth ā in other words, doing things that in the absence of foreknowledge would increase risk.
Those who feel they donāt know what the future holds will act quite differently: diversifying, hedging, levering less (or not at all), emphasizing value today over growth tomorrow, staying high in the capital structure and generally girding for a variety of possible outcomes.
Regards
Arun