since gold is also priced in dollars, then the graph is of the relative dollar investment in gold and bitcoin ain't it? "price" is just a measure of number of Unit of Account chasing a particular commodity right? so when the UoA is a fiat currency and everyone is seeking a safe haven for their purchasing power, the USD-denominated BTC/gold chart shows the comparative USD investment in those things. if you're interested in gold vs BTC investor sentiment its important data but otherwise.... meh