Thank you for your efforts in doing this research.I would like to point out one thing when it comes to inactive accounts: Some people register (like my girlfriend and my room mate),and then forget about it,because it´s new to them,they have others things to do,and it seems a bit abstract.A lot of people have the intuition that the money in Steem is not "real" because they are not used to cryptocurrencies.I think my girlfriend will reconsider when her steemit account balance is bigger ,in a month or so..