Thanks. :)
Upvoting yourself increases your rep for one thing and account balance for another. Every little counts. Others? You never know the relationships you could make / break through upvote politics, eh? I think it's a pretty trivial matter, personally, minnow to minnow, anyway. But as the site ultimately revolves around upvotes, basic etiquette would have it that you should do what you think's right, I guess.
Life's too short to worry about it all unless you've gone out of your way to help a poor, floundering whale!
I think we call it reciprocal altruism.
:)
totally & thanks.