I think that in the absence of a rule (or at least an etiquette statement), self-upvoting should not be bashed/downvoted. Many people have invested actual cash out of their pockets into Steemit (yes, I mean INVESTED, as Steemit is many things at a time, including an investment opportunity...), so for sure these people (including myself) have the right to seek a return on their investment using any allowed means, especially if they lack the time to provide content. The old notion of "silent investor" should be recalled - this is someone who contributes cash into a venture, but does not play an active role in decisions, value creation processes, etc. Nonetheless, having taken the risk to invest, his contribution deserves a financial return even if he does "nothing" after putting the money.
So....I feel fully entitled to upvote this comment of mine :-)