It's no secret that most mainstream economists don't think too highly of cryptocurrencies. Not only have Bitcoin, Ethereum and the rest produced the "greatest bubble in history," but they're "neither a serious method of payment nor a good way to store capital" — at least according to the Bank of America and Nouriel "Dr Doom" Roubini, respectively.However, while traditional financial experts have spent countless hours complaining that the volatility of cryptocurrencies renders them unviable as actual currency, it is possible to use them as money in a wide variety of places and to spend them on everything from pizzas to shoes.