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Well - old posts won't start a new payout cycle and earn additional rewards past the first 7-day window.

But being able to revisit and revise those posts is a huge deal. So many old posts come up in google results and still get large amounts of traffic. I'm questioning whether or not this change made it into tomorrow's HF or not though... need to go ask.

Another thing is that you could get the hold on the markdown code that you've used in now locked posts. Very useful :)