The reality is the market value of anything is influenced a great deal by human sentiment, as well as raw intrinsic properties of an underlying asset or the performance of a business.
Investors like to think they are actually "investing" in Google when they buy Alphabet shares even though not a single penny of their money is going to Google for the board to direct toward productive endeavours.
Even earned income in a savings account is an act of faith... in a system that we hope will continue to value an hour of our labour today to something close to what it will be a year from now. The savings account itself isn't a store of value, it's the nature of the labour market here that is actually the store of value.