See if two people can and do the same exact same work but receive different amounts of money, then work is not the key element. And if two people can buy the same object for two different prices with the possibility of one of the prices being something other than money, then it clear that money is not the key to getting the object.
Is money a surrogate for barter? In a barter system the bargaining power of all the players is crucially important. In 2006 a man traded a red paperclip for a fish shaped pen then thirteen trades later for a house. a lot of value sure came from somewhere.
money is interesting and convenient but really nothing more than a way to turn bargaining skill into an easily transacted commodity.
In other words money is a representation of bargaining skill or power. Work, skill, time, looks, things, even ideas can all be used as bargaining chits but really all of the value is determined by the people making the deals. Nothing has any value except in relationship to something else. That reckoning of value is controlled by the player with the most skill. This applies to everything relating to money.