Bitcoin is currently over priced (still by several thousand dollars) but has lost over $2000 since yesterday, and is making lots of headlines. It is only one of several viable cryptocurrencies and the idea of accepting a limited range is not unreasonable but not only Bitcoin. The one that is currently most used at the moment is Ethereum. The club would just need an account with someone like Coinbase where they could convert payments back to sterling, but they would need to do it immediately or risk losing or gaining with the volatility of the crypto currencies market. All the cryptocurrencies are splitable into small fractions of a unit.