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Maybe something like SBD interest where you have to touch the account to get credited with the extra VESTS?

BTW, it is Dan's idea. He suggested it as a future fix on the call when the reward curve was changed to remove the concentration incentive. Did not mean to take credit.

Yes, that's possible. Then the inflation calculation need to change a bit.

A side effect of this, is that people will be encouraged to group up and share bigger accounts, to earn more interest, like Dash Masternode crowdfunding. I don't think it's a very good thing.

Good point.