Good point. It's very positive that not all the rewards are getting given to a tiny group of people.
I looked some time back at the distribution of account values compared to this 1% figure. It's not quite as high at the rest of the world but it's still quite high. It's not trivial to get this stat though because some people own multiple accounts and we don't know who exactly these people are, especially for some of the big accounts.
True. Multiple accounts and cross voting from one account to another is common. Though to draw money or shift Steem outta Steemit, just one account (the primary one) is used (my limited observation)
At the same time, people make multiple accounts and keep one of them accounts just for upvoting minnows and plankton (again my limited observation over the last 87 days)
I have myself been beneficiary of receiving massive upvotes from such accounts on 4-5 occasions.