I like this report! Hope I knew how to make it myself or found a way to learn!

If I can throw in a couple of suggestions?... I think you could add some dimension to this analysis by looking at how much money was invested in Steem vs. how much money was taken out, and if you divide that by the same categories you are dividing the current charts (by how much posts earn), then this would tell us if the old claim of "minnows are destructing the platform with their endless mining" is fact or foe.

Also, for the money invested, it should be interesting to see how much were just power ups from accumulated post payouts vs. external money coming into the platform, and who made those decisions (Minnows, Dolphins, Whales?) .. Are the whales/dolphins getting ahead so fast that there is no way to achieve a better distribution of stake other than attract external investment?

Also a pie chart with a distribution of SP and # of users. This may be available already...

It seems to me (other opinions welcome!), that external investment is not encouraged by these results. I bet that if we look at the charts I've proposed we will see that it would take an obscene amount of money for someone new to get to a point where he can earn a decent, steady income for regularly blogging good content. If I'm right, then the system is encouraging shitposting, cause you have to make it efficient to rise through the ranks, knowing that the battle is against big, ever growing giants!

I've also heard that retention is an issue, and with this data I'm not really surprised, assuming most of the unused accounts are owned by people whose posts never got more than 1$ in rewards.

Overall, if we can make a report that gives us the full picture, then surely the very intelligent people of steemit will start providing ideas for solving this platform's growth bottlenecks. And these ideas will not be based on opinions, but facts.