I suspect there are a large number of 'bots' out there in Steemit land. Also check out the number of new accounts being created with delegation. I think a large number of those are probably whales ensuring they remain whales and getting even more curation rewards. Look at https://www.steemd.com/steem.global:2001 You can also check your stats there too by entering your user name https://www.steemd.com/@username