I think both is genuine - I do upvote my own posts 1-2 times per day, and might give small 5-10% upvotes to a few of my comments if I want to "bump" them towards the top of the comment list.

But when a user is spending 30+% of voting power on themselves, I start to personally feel a bit annoyed, like "c'mon, help out the community! This isn't just about you!"

Only my two cents, definitely - my opinion is only one of many.