It may be that World of Warcraft made an announcement recently and had a new patch of TBC Classic release. Perhaps the ad pool is going to more WoW because of this.
Example: an ad agency buys 10,000 views and last month nothing really happened, everything was in the normal state, we saw our normal points per day. Then this month WoW launches stuff and while MC still gets it's normal views the ads are seen by far more WoW players and or ran out. So WoW ate up 5000 of those views lowering the available pool for other games.
As a WoW addon developer I saw my points go up slightly.
Anyway, just a hypothesis.