The value (scalar desirability) of human "things" has always been variable, and likely always will be. Ever since Arg built a "better" stone axe. Function for purpose, rarity (real or artificial), perceived "beauty," perceived "quality." Gold as a metal, of itself, has little intrinsic value except for industrial uses. But its immutability, its workability and perceived beauy, and its relative scarcity have made it valuable to humans once they were past the survival stage of evolution. To chimpanzees or dogs, it's not as valuable or desirable as a banana or a lambchop. It's all a matter of perspective.