Ok, so, It's because..
They produce nothing 
They serve nothing 
That's why their value goes down to zero..🤣.
You can't keep the non value creating entities afloat..,without printing too much and killing the currency itself..
They say, The EURO has lost almost 90% of its value against gold in just 25 years.🤣🎈☕👍.
 https://image.nostr.build/93fdad49c40efbbc5fd03bd951423786afa4717d9ccb07cf87300739f618786e.jpg