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As noted in the article, Buffett also shuns tech investments - and Buffett has said he doesn't invest in something he can't understand well, and he doesn't understand tech.

And he's not wrong. Nobody understands the conditions for the future success of companies on the edge of new technologies on the kind of level that makes Buffett comfortable enough to invest.

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Exactly, Buffett's whole investment philosophy revolves around margin of safety. What's the margin of safety in a fast growing speculative space such as tech? Zero.

Not to say that you can't pick winners, but it is wholly different from buying a controlling interest in a company which has the potential to reap high profits with tighter management (see, Coke, Wrigleys, Wendy's, Railroads, etc).

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