Because events are to alert you to things around the site, not for storage.
You have plenty of avenues for that (screen shotting, your own personal storage, using the notepad widget, etc) to remind you of things.
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The same thing I said in the news post - you can write that down yourself in a notepad, use the note widget, etc.
The events are not for storage.
Shop sales are not logged outside of the CS log (for UAs), but could potentially be in the future.
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I think it's smart to have the events cleared. After you've seen what was pinged, it's not really necessary to have the event there permanently. If the post or thread is very important to you, you can add a link to your note widget and link yourself that way. Awhile back when people had HUNDREDS of events/notifications during a site plot, and it literally slowed the load time of every page they viewed.
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I don't think people are dumb, I just think that they are using events in a way that we didn't anticipate, and a way that they aren't meant to be used. The system is there to show you that something has happened - nothing more.
If you tell me the things you wish you had available elsewhere (I'm working on the CW information being readily available) then I'm happy to try and make places where that information is available, just the events aren't it :).
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The events aren't a way I would organize, so this doesn't affect me, but I completely understand why people do it. At work, whenever I get an email, I like to organize the information to the correct place immediately, and keep my inbox to being completely empty of emails. (I have a little subfolder called "working on" so I don't have to keep it in my inbox.)
Many of my coworkers, though, keep everything in their inbox until they're 100% done with whatever the topic is. A lot of them have hundreds or thousands of emails. I look at what they do, and I know I would never keep track of anything if I did it their way, but they also don't understand how my organizational style works for me. I figure this whole event thing is more or less the same thing. Just different ways of understanding the information and compartmentalizing it in a way that works for you.
I don't have anything to contribute over how best to organize the information taken from events, but I can understand both sides.