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It works. You get the money. It's just not a good long term plan.
I don't even upvote my own posts.
I'll occasionally upvote one of my own comments if I want it to hit the top of the pile, though.

Ah, "hitting the top of the pile", now I get it...

I was thinking about "making more earnings"...

So it is a practical means to the --exclusive-- end of promoting one's own comment, would you say?