If we look at the movement of gold in a bigger time frame, we might think gold is just about buying and buying, because the charts only show the charts go up, but if you turn the TF into a smaller one, you'll see the same pattern as the currency has. it also contains high and low. Gold has a very slow but stable movement for the long term. For this reason, many traders choose not to trade in gold. The more rare a currency / commodity to trade, the more spreads. Thus, large spreads not only occur in gold but also for all currencies and commodities that do not have an active trading session.