A good number of cryptocurrencies do provide real world value, just because it is not a physical good doesn't mean the value doesn't exist. And many of the cry

A good number of cryptocurrencies do provide real world value, just because it is not a physical good doesn't mean the value doesn't exist. And many of the cryptocoins are Proof of Stake, or planning to switch to PoS (such as Ethereum). This, besides requiring far less energy than the Proof of Work mining for block validation, allows someone who purchased the coin to gain more coin. By staking coin to assist in the validation of blocks, stakers are rewarded a percentage of the transaction fees as payment. They do not need to buy equipment to mine and effectively earn interest on staked coin. Even if you bought in at the point a coin stabilizes and no longer appreciates, you could still increase your wealth without needing the price of the coin to increase.