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That declined payout option does interest me too - what is the purpose of it exactly?

It has various use cases. System announcements that want to go higher up but not get rewards, people wanting to thank other people (without milking the second post of "thank you"), people wanting to write something without being criticized for doing it for the money, etc etc.

Oh I can see this more clearly now - Thx @alexgr (not for money!)

thanks for enlightening me! i can see the clear benefits for those reasons in using this now. great addition

As far as I understand the account posting declines all possible payout. For every round, now and in the future. And once decided, it can not be changed.
(What I don't get yet is why it could be a one way deal only, but that is not clear if curators still do get the deal and how much.)

One reason could be that an account, of the developement team for instance, wants to make an announcement. They like to see the upvotes, but don't want to get the Steem out of the total reward system. As it is' just' an announcement.

Also an account may choose not to get a part out of the reward pool available that round, so others can get some. Although there is a fair chance that it will go to the allready big earning accounts.

For me it is part experimental, to see what it does.

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