Digital currency bitcoin has risen by more than 200% in 2017, and it actually broke through the $3,000 level for the first time just hours before I wrote this -- and dropped by more than $500 soon after. It's fair to say that not only is bitcoin hitting record highs, but the market is extremely volatile. Many people have made speculative investments in the currency, with no upper limit to the price of a "coin" in sight.

While I never recommend buying or not buying an investment simply because of what a billionaire says, it can be a smart idea to listen to what some of the most successful people in the world have to say. This is why Warren Buffett's investing wisdom is so widely followed, just to name one example. With that in mind, here are what three of the most respected billionaires in the world have said about bitcoin.

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