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Re:Cryptocurrencies are the tulip mania of the 21st century by mannykannot on Tuesday September 19, 2017 @11:55AM (#15285744)
And tulips are still being bought and sold. Bubbles tend to have a life of their own, regardless of the MacGuffin they are organized around.

https://en.wikipedia.org/wiki/MacGuffin

I don't know about cryptocurrencies in general, but ICOs seem to me to be mostly foam.

Re:Cryptocurrencies are the tulip mania of the 21st century by dnautics on Tuesday September 19, 2017 @12:51PM (#15286331)
Bubbles also tend to be driven by leveraged investment. See kindleberger.