After two (and soon three) “generational” market crashes, Joe Sixpack may have lost interest in the stock market (or at least in single names, the transfer of bagholder rights from institutions to retail investors via ETFs is doing just fine), but when it comes to chasing torrid, upward price momentum, US retail investors are doing their best frenzied Chinese housewife impression now that they have discovered the next big bubble thing, and it’s called bitcoin.