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The originator of the currency often has a purpose they wish to fulfill, e.g. do Artificial Intelligence research, provide co-working spaces across the globe, or create a credit card powered by Bitcoin, and they explain this in their White Paper.

Some believe a cryptocurrency has to have some purpose if the cryptocurrency is to have value; while others believe that all you need is a ton of users (coin owners) who all just simply believe the cryptocurrency has value.

When you look at the old-style fiat currency (like dollar bills or Pounds Sterling) most people give those pieces of paper some value by just simply believing it is worth some value - its a community agreement to accept & use such pieces of paper in exchange for goods and services.

I believe the purpose of EOS was to also provide blockchain developers an easy to use framework to create scalable feature-packed blockchains. So you can consider that the crowdsale is more-or-less a charity.

I've been following their source code on the Git repo for a while and it's truely revolutionary stuff.. If the EOS blockchain does come out, then you will be seeing other developers forking it and creating their own.. And I think for that mission, (ie. creating a framework for scalable blockchains) EOS is of interst to me.