thanks for the precious infos, i will surely go trough reading all, but it will require time, since you seem informed...

" up-to-two-thirds-of-bitcoin-transactions-have-no-economic-value" i feel you... but in my opinion this number doesn't mean a lot, it raises some more questions:

 is it because there is not a real marketplace? so people don't really know where to spend them?

two-third of transcations could mean billions, i don't know how much it could be in real $$, so even if getting a 1% of them could mean some millions.

is it beacuse after the stall bitcoins got everybody is holding their positions? so next bull market people will start spending them? those are great infos, but they don't really clear why people wouldn't use them as a currency