why the coin is so expensive?
Your answer can be found on the first page.
- Fair distribution (call for participation) with 3000 stakeholders
- Proof of intent (distinct form proof of work and proof of stake)
- Large, skilled, development team. Gimre and Jagaur were contributors to NxT. The other developers had roles in other successful coins.
POI = Proof-of-Importance (not intent; this is not mineable)
I've heard proof of Interest mentioned before. I must admit, i prefer Proof Of Interest over Proof Of Importance. Seems to fit the community spirit NEM is trying to cultivate. Even moreso when you consider it's egalitarian principles -- "Importance" kinda doesn't fit that message, yet anyone who invests more time and energy (Interest) in supporting the infrastructure (and said principles), deserves to be rewarded.
So, in a nutshell, i think it should be referred to as Proof of Interest, not Importance

Which reminds me, i need to read up more about how to run nodes as it is something i will be happy to participate in once the ball (coin) gets rolling.