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If it is about protecting resources and the blockchain and all that could be at risk if everyone decides to quickly get out of hive, I agree that the fee should be 30% or more for instant powerdown, to all other fees I am against.

If everyone got out, the ones that did stay would earn such a high APY, so it would somewhat offset the temporary increased sell pressure. We have been through an extended bear market, the whales that wanted to powerdown and leave did a long time ago. I highly doubt we would see a huge wave of instant powerdowns but if we did I would certainly welcome it to get all those extra rewards for sticking around.