Until they are well understood and accepted by most, cryptocurrencies are a tempest in a teapot. When the gas is turned off, the agitated frenzy will cease and all that will be left is some water at the bottom of the pot.
Today the gas the keeps cryptocurrency afloat is the tight monetary policy of Red China.
I have no problem if someone wants to gamble a few dollars on Bitcoin or Ethereum. It is the traditional speculation of any new product, or in this case, the technology underlying the cryptocurrencies.
The entire run up in January was due to massive Chinese influx. They own 75% of all cryptocurrencies due to the difficulty of getting the yuan out of the country, and due to their massive crypto-mining operations all over the country.
If China ever changes their tight yuan policy, then the cryptocurrencies drop back to $100 or less.