The in-season dates for startup and programming news seem to be in the months preceeding YCombinator application due dates. I think the combination (pun) of a startup mindset at those times (possibly in both voting and submitting), and users trying to get some posts in, could be why.
It is interesting what is fair for the Drudge Report is not fair for the Drudge Retort... I doub't if they can have it both ways unless if the Drudge Report has a sepcial license, which I am sure they don't.
http://news.ycombinator.com/item?id=218496 http://news.ycombinator.com/item?id=218540 http://news.ycombinator.com/item?id=218550