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Usability is what a coin derives value from.

no it is not. I mean it would be in a perfect world, but we are not living in a one. So what makes a coin valuable is, how good or poor marketing it has - that is how average Joe or Marry appreciate it and decide to or not to invest into it. This creates, after some time, if the marketing is still good and people keep hearing about certain coin how it will go to the moon, the so called FOMO effect, so more people invest in it. They invest without knowing a shit about the team behind the coin, without having read the whitepaper, whitout having instaled wallet for the coin etc...The coin is raising though and after some time it falls. Last but not least we have FUD makers here and big whales who just pump and dupm some coin. So you never can tell, that some coin is doing great because it has great usability and other coin does not, because it lacks of usability. As example take a look at BTC, ETH or LTC - slow, sometimes it can take hours to transfer those, big transaction costs and at the top of all, they need to be mined, which is not very enviromental friendly - still they belong to the most valued coins at the market...