I thought this too - but there is no visibility benefit to upvoting your own posts - visibility comes from followers and resteems.

In fact - you may be harming your potential curators - making your post less desireable for an upvote - if you artificially inflate your post too much! @curie won't upvote you if you go over a dollar, and individual curators are less likely to see the benefit if you have, say, large upgoats on every post.

As a social experiment - I feel free to freely mix my opinion with what I think is fact - but consider my anecdote - I had written this post and was eager for people to see it. I had won some whale shares and only a few hours after posting I had lost all patience with waiting to see if someone would look at my article - I dumped 50 whaleshares on my post for 'visibility'. A $7.50 upvote!

Guess what? I shot myself in the foot. No one wanted to touch it since I had poisoned the curation well, no one but a larger whale was going to see any curation rewards from my post, plus everybody probably thought - well he got 7 dollars thats pretty good.

Upvoting comments actually do increase your visibility. It still may not be right, but at least it works!