Love your exploration of this in depth because of the conclusion we need to keep self upvotes to limit the value of making duplicate accounts! When I started out on Steemit, I upvoted myself a lot until I realized it felt better to give for others. Self upvoting presents a great opportunity for most of us to learn that we feel better giving to others than to ourselves! Still it is so tempting to drop that upvote on myself and I appreciate you helping me remember to save my upvotes for others!