Past performance of other investment securities is no guarantee of the future for other ETF's. Gold is actually a real thing, we mine out of the ground and is used for jewelry, coins as well as a number of industrial applications. Bitcoin was made up out of thin air, isn't a company or business, generates no revenue/income/profits like other real companies and is poorly regulated. The only 'value' bitcoin has is the result of finding someone else who wants to pay more for it then you did. Somewhat like musical chairs. When the music stops...............don't be left holding that bag of nothing.