There's been some discussion about incentivizing people to do useful things for the community by putting up karma bounties, thus removing some of the uncertainty inherent in upvotes. The most comprehensive thread I could find is here; two years old, but LW development grinds slow.
That's my best guess, anyway.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Of course, for "every Monday", the last one should have been dated July 22-28. *cough*