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Comments are on the same level as post, after 7 days any votes are just tossed down the drain. No one benefits.

Ah... I read somewhere that they could keep on earning. Must have been mistaken.

If you comment on a post it starts the clock on that thread with its own independent 7 day window. If the author answers you, you can upvote his comment ... and he can upvote yours and back and forth as long as it lasts -- and stays in the time-frame ... just like now. But I've found not many people catch those late comments -- or at least they don't pay one bit of attention to them. (Could be Steemit's lousy notification system, who knows.) Mostly, if I find something worth voting on that has expired I just go upvote something current. Job done.

But, yes, as a creator of evergreen content on my own blog, I have found the fact that it all gets lost and becomes worthless pretty depressing. So I've stopped putting out much that doesn't have an "expiration date" attached, like forecasts, etc. I get enough of my writing stolen off my own website without adding to the problem here -- where I can't touch it. IYAM, the 7 day window is so obviously stupid it could only exist on Steemit.

Once upon a time the payout window was 24 hours ... so I guess someone thought they were doing us all a favor by extending it to a week. But the truth is -- most content is basically dust 20 minutes after you publish ... until you have a network to push it to ... and a few voting trails to help keep your morale alive.

What a mine of information you are! Thanks for straightening this out. And for the other historical points of interest. A 24-hour window! Hardly an incentive to quality.
When I included this comment in my post, I thought someone was going to point out a good reason for having the 7-day upvote window, but so far no one has!
And you're right about not catching those late comments – I regularly check "replies" and I've noticed that at least one reply made to a reply that I made on someone's post was not included in my Replies. Maybe it's because the person did not reply directly to my comment, although the comment was meant for me. Luckily I found it anyway.
Sad to hear you get writing stolen from your website. I've built a website where I post almost all of the content I post on Steemit. I built the website in the hope that it would give those Steemit posts a longer life. I think in the long term, websites will be great for promoting Steemit, especially if they're as good as steemstem.io.