There's really more than one question here.

If I was Warren Buffet, the answer is easy... no.  He doesn't like Bitcoin and is from a "buy and hold" generation when companies paid good dividends on quarterly profits and banks paid a healthy interest rate on savings.  Buy and hold has always been his claim to fame and Bitcoin now offers none of the "investment" features he's looking for.

If I was AS RICH AS Warren Buffet, the answer is still easy... no.  The only reason I see to buy that many Bitcoins is an attempt to take over the network, in which case you may end up with all the Bitcoins but try finding anyone else who wants them.

People with extra money will most likely seek gold, silver, commodities, and other "safe havens" long before considering Bitcoin.  Unfortunately I'll have to agree with them at least until Bitcoin has some semblance of a stable value and is more widely accepted.  Until then, buying Bitcoin is a huge gamble, not an investment or the protection of wealth that we'd like it to be.

Hope it changes but I still wouldn't kill the network/market even if I had the money to do so.