The "monetary value" is the developing block-chain technology of what a particular crypto is based on.
Because as how things are currently, there is a search for a new monetary system which needs to be a departure from the traditional "paper and coin" system we've relied on for the past few hundred years. But as how one coin operates differently than each other, various software developers are creating their own coin to out-perform others, in terms of gas-fees and speed of transactions. Some (like ADA) are pushing to re-invent the entire way we view money and economy too, an idea that surpasses the notion of "a new kind of money".....and people put their faith in that....no different that the government telling you to put faith in their traditional fiat currency, which isn't backed by much value as our goods are being imported/exported, and the west doesn't produce as much as it did post-WW2....The CAD and USD isn't really worth the paper it's printed on....
So the way the look at crypto now is, playing the "exchange rates" with a country that doesn't (physically) exist (yet)...... and instead of looking at it like a Ponzi scheme (which is basically what Wall-Street is anyway), look at it like a bubble. I agree that crypto's value will be finite. But that's not going to happen for a long time coming, since a coin would have to be a widely accepted form of currency in order for the value to drop. And not just be able to buy Teslas or shop at Walmart (which in some places you can),...but to get paid as an employee, and use the coin in every aspect of how we live our lives already with fiat. Until then, it's a race to see who can make the better coin to take over traditional money.