This can be true if we take into account the fact that virtual currencies are the future of economics. First, if virtual currencies keep growing, many millionaires will appear very soon. I believe it is a good idea to keep some bitcoins. A great investment is not necessarily the one that everybody knows. In this case, bitcoin is very popular but it does not mean that it is reliable. People are afraid to invest. It has nothing to do with virtual money by the way. They just do not like investing. They are not used to it. To sum up, I agree with you. Anyone who invests 5,000$ now in bitcoin will be a millionaire by 2025. In some years, we can check this fact.