my guess for the change would be key resellers (moreso than traders). You see a ton of extra keys pop up on g2a and the like each bundle, which, from the dev perspective, is kind of frustrating. And it probably also aligns with however they currently pay out to the publishers.
Still, $132 is a really, really good deal based on almost every month to date. You almost always get a great game that by itself has never been less than $12, and almost all of the games always have really good reviews, with a mix of genre types. Not to defend ign, but developers seem to like how humble pays them