Raising payouts would also raise them for the 'big ones'. I think if its a good APR then its good on a little or a lot. If you could earn more than pennies curating those tribes, you would do it. 4 pob is worth like 6 hive, or 3 dollars, even 100% apr is less than 1 penny per day.
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Yes, I somehow realized it after writing my comment. That would do exactly the same. Just more delegation to it but since the APR goes down depending of the delegation, it would probably stop at the same step.