High Street Ten once-popular brands that have disappeared from the High Street in the past decade. Although there is only anecdotal evidence of this, there is believed to be a growing number of people maxing out their credit cards to buy cryptocurrencies in the hope that their price will appreciate. Work your way into your portfolio over time. The chairman and chief executive of Berkshire Hathaway has joined the chorus of voices criticising the digital currency. Critics say cryptocurrencies are used by criminals and rogue states to carry out clandestine transactions.