Hello, the opportunity to buy Bitcoin profitably is determined not only by the exchange rate of the coin. It is also important to consider the size of the commission when making payment transactions. It happens that the site offers you good conditions in terms of the cryptocurrency rate. But all this benefit is “eaten up” by the established commission size. So be sure to take this point into account. For example, the trustchange exchanger takes a small commission, and this is one of its main advantages.