I think it's because of some linked images which can generate a hit every time someone views a character sheet page or [Redacted].
Fun info dig, 25,997 (8.86% of 293.42k) people are linked to this site from another web site so let's focus on that for a moment. Calling it 26k, 16,395 people from GitP come over to MMB for stuff while only 4,971 people from MMB go over to GitP.
It also appears we compete against TV Tropes, and fyi we'll lose that one.