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For bigger accounts it most of the time is the most profitable thing to do at least short term. If you want to beat the 10x daily self upvote you always need even bigger accounts to upvote you. That's the reasons many of the whales turned into upvote bid bots. Steemit just needs a much better distribution. Whales support mainly dolphins, dolphings support minnows and minnows support plankton. To make that happen we need a system where curation does not get punished like it is now which is one of the things I actually try to test out with this model.

Don't forget that it's impossible that everyone wins. I mean if one account grows explosively that means others don't. Someone needs to pay for it.

Actually in theory it is possible, Steemit owns a lot of SP that can be used to reward proper use of Steemit instead of purely selfish use. that way everyone can theoretically win and get more than a 10x self-upvote back. That's just theory though

Is Steemit now using all that SP for self upvotes?

But even then if you win some, someone else will lose some. There is no concept where money is for free.