As I said, posting something to over-reward it with self-votes it is not cool.
I don't think the problem would necessarily be your fifth post earning more than 90% of the posts on the platform if it brought commensurate value to the platform. For example, I like it that Taskmaster posts as much as he does because he's easily one of the best authors on this entire platform. He's someone whose posts are good enough to embed in comments and posts on various fora all over the internet. We have a serious shortage of material that is that good here.
As for using alts to post, I don't think a lot of people who only use a single account for posting everywhere realize how large a part of their rewards are the result of their networking. It's rather foolish to think that making three alts and tripling one's posting volume would result in a tripling of author one's rewards even if the hike in volume did not result in any poorer average post quality.
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I didn't mean the earning, I meant the quality of it. I could sit all day and write and have sometimes thought about running a 24 hour challenge for it :)
The alts aren't that much of an issue, until that person also has significant stake and uses it to upvote the alts multiple times a day, while hiding that they are alts.
I agree if the content were too poor for the rewards. Otherwise, it would be a problem to the extent the community did not use their downvotes to trim the rewards.
I'd say that even with significant stake, creating alts just to be able to self-vote more than is deemed appropriate is a losing strategy in terms of rewards. Users with very large stakes tend to be followed and upvoted by others anyway. Posting with many accounts forfeits that advantage.