Money in dreams embarrassed nobody until psychoanalysis got to it. Freud's school, beginning from his 1908 paper on character and anal erotism, bound money in theory to the body's earliest economy, and read dream gold and coin through that link, pointing for support to the folklore in which the devil's gold turns overnight to dung and to the German idiom of the Dukatenscheisser. The reading is the school's own, recorded here as such, but the folklore it cited is real and old: treasure that will not keep its value at daylight runs through European tale collections.
The older dream dictionaries read money with the tradesman's directness they brought to everything, finding coins toward gain or, by the rule of contraries, toward loss, counterfeit toward false friends, borrowed money toward obligation. Their instinct that dream money is about worth survived them.
The modern composite reading runs on that line: money as the portable form of value, so that dreams of finding, losing, counting or being robbed of it are read as statements about self worth, security and what the dreamer has to spend, in effort, love or standing, and on whom. Interpreters add the sensible floor that money is also the plainest waking anxiety there is, and a dream ledger may be balancing nothing deeper than the month's accounts. The readings are conventions of their traditions, and they disagree exactly as much as the traditions do.