Good question. Jerry is somewhat of an "authority" but he does advocate self-voting, in another post which I noticed from a screenshot in the above: https://steemit.com/steemsecrets/@jerrybanfield/earn-24-renting-steem-power-with-minnowbooster-8

I was interesting in reading that other post, because I had used MinnowBooster but recently have found that using http://steemvoter.com is working much better. I'm staying down around 40% voting power, which is fairly low, so I'm probably going to change the 23 (20 from the contest last week which I put a link in a different comment to you, plus 3 from an even earlier contest) from 50% voting power, down to 25%; I already changed them from 100% to 50%, the day after announcing the winners, as my voting power had dropped dramatically.

Anyway, a lot of folks say self-voting is bad, and some whales will downvote/flag self-votes that they see, which both eliminates the earning, and often has a negative effect on the self-voter's reputation. I did, early on, and stopped once it was pointed out.

I have come to be of the opinion that I will never self-vote myself, with two exceptions: one, an "angry whale" decided to attack me a while ago, so I self-voted to undo the damage he had done. Two, when I make a comment to one of my posts and want it to be the first thing seen, I'll upvote it 100% so it will be above the other comments that I've upvoted -- which I generally upvote 10% for everyone who comments on my posts, unless they're obviously fishing for upvotes or follows, and sometimes when I just can't make sense of it, as ambiguity could be positive or negative, so I generally just leave those alone.

Anyway, I see this as a flaw in Jerry's otherwise excellent output. Then again, I still have a lot to learn! :)