First off, thanks for actually noticing. Honestly we have a couple reasons but the biggest thing is that we have been bad and are on a path to recovery.. we want to get a regular newsletter out and start building it up with useful information. We haven't pushed or promoted this change to see how things go but here's our biggest reasons:
1. While we need income to sustain the site, renting out our mailing list out makes us feel cheap and dirty.. It's like stealing a loaf of bread to feed your family. You do it because you feel like you have to, not because you necessarily want to. if we fill all the slots with our own list we can just embed partner advertising in our mailing list and the reader gets up to date content along with the embedded ad. That way we can support the site while still supporting our members.. it's a win-win.
2. We need to send more frequently than once a week because of the number of articles we are posting, but for right now we need to tweak what goes into the mailing list a bit more to add in more "fresh" stuff. Today, for example, we posted three new articles.. which would be half of the new article slots. I want authors to get as much feedback and exposure for their articles as I can get them.
3. The open rate is typically about 3% (meaning 3 out of 100 people even click to view the email), so most people will fail to read even a weekly email anyway
From what I can see from doing it three days so far I would agree there is duplication.. if I might change your thread a bit, I would ask a different question:
What would you want to see in a newsletter from us?