The person who responded to the Quora discussion gave his personal opinion, and it could be realizable or otherwise. Investing such an amount in Bitcoin is not a bad idea because, historically, Bitcoin has proved to be a profitable investment. But you should also be willing to take the risk since highly profitable assets can also lead to high losses. Before you put your money into any investment, it is important to do your research. Don't just believe any random post you see on the internet because most of them emanate from mere speculations.