The fact that there is a unvote your own post at the moment of posting checkbox shows that the platform doesn't frown upon it. You've taken the time to make a post, if you can vote for it, I think that's generally OK and if it's normal behavior for minnows, it should certainly be normal behavior for whales too.
The thing is, with the new voting curve, there is little insentive to vote for anybody but yourself because your curation reward is not likely to be much higher. Our votes have become more valuable but unfortunately, the fact that they are fewer makes most of us quite stingy with them.
When people had 40 votes to spend per day, they could throw some outside shouts, upvote some comments and still have enough voting power left to curate and even if there was a small self-upvote here and there, it didn't matter so much.
Now our votes are more valuable and with the flat curve, we don't really have a logical reason to spend them on others besides the health of the platform and not looking like self-serving d-bags.
But the rules are what they are and HF19 is a reality.
I recently saw that it's been the first week in some time where the total number of posts and the total number of new signups has been in decline. That might have something to do with the fact that there are fewer votes floating around so it's now actually harder for new and unrecognized users to get some love.