We just started doing this on one of the sites, sort of as as an experiment. We started rotating content out (new update in - oldest update out) about a year ago - hence have a years worth of archive updates.
Now we alternate archive content with new content enabling us to get more frequent updates (daily instead of every 2 days) for the same expense.
- for the old member: they saw the updates already but they are not losing anything since new stuff is being added at the same rate as before
- for the new member (majority): all these updates are new so the site becomes more valuable
- we get to advertise "daily updates"
All this assumes that once a member gets access to an update he either saves it or jerks off and is done with it. Obviously it doesn't work if they "bookmark" it and keep coming back to it because it will eventually disappear, so i guess that's a downside but i think a minor one.
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