Do not promise that you will not buy bitkoyn in cash. Still everything can change and your opinion on this matter as well. Why do I have a non-functional bitcoin? It will soon be used as a container of value, not as a means of payment, since the transaction time is too long, and the commission costs are decent. Is it not better to use those coins that do not have such problems? There remains the difference in price. However, it is also very volatile.