When you put money into blackjack you're not buying an asset. A crypto coin is an asset that can be held. Just like a share of a company, or a dollar itself.
yes but it's a bad analogy because the odds are known and if you don't win the lotto the ticket is worth nothing. all bitcoins are equally valuable ( fungibility ).
But all cryptocurrencies are not equally valuable, and there's no reason to think that all of any given crypto won't eventually equally be worth (arbitrarily close to) $0.
I can imagine a lottery where usually nobody wins anything but every now and then everyone who bought a ticket wins collectively. It's still a lottery.
With stocks, for example, I can make a prediction about a company's future performance, buy or short accordingly, and expect that if I am correct I will profit.
I may be wrong about my prediction, but if I am correct then I've got far better than chance odds of also being correct about the future price of the asset.
Without making any further predictions about the state of the world I can equally easily imagine the price of Bitcoin in 5 years being $100 or $100,000. Neither price feels "wrong" the way it would if, say, Google's stock price rose or dropped by an order of magnitude without the company changing anything.
A bitcoin is as real as anything else. It's ones and zeros stored in a distributed ledger on computers around the world. I'm sorry you're having trouble predicting the price, look up supply and demand. Either way it doesn't make it any less real.
Company has assets that can be liquidated. Even if people decide a company has no value there's still assets that can be liquidated to provide capital back to shareholders. If people decide a crypto is worthless, its worthless.