I don't think that upvoting your own post is necessarily negative, especially when you're a user with not very much influence but in the case of this post and what's being discussed, it is a husband who has a powerful account upvoting his wife's posts or allowing his wife to use his account to do it herself which results in them getting a large monetary reward which doesn't necessarily reflect the quality of the posts or their unbiased reception by the wider community. At least that is what I understand by all of this, however I could be wrong.