Nice one - I think the Cash / crypto / steem reward generated via bots or booster services is more of interest - @felixxx did a research on that - roughly 16% - check his post:
https://steemit.com/steem/@felixxx/how-much-of-the-rewards-get-distributed-by-boosters
Self voting for people that might be interested in that, check out the post by @felixxx
wow thats alot! Thank you for linking. If he is not far from the exact number, 16% is quite worrisome for the long term health of the platform...