My general opinion on content that is either outdated (jokes about dwarf-eating carp and elephants etc.), or not part of game mechanics (a picture of real malachite, a trivia bit on how soft gypsum is, etc.), is fine in a wiki as long as it's obviously marked. A big header of "In A Previous Version" makes it pretty obvious for anyone reading the Carp article that the picture of giant carp eating a miner is no longer an accurate representation of what one could expect to find in their current game, but that if they for some reason played an older version (some do choose to, either for special games or just because they like it) there is an interesting quirk. Similarly, a header for "In Real Life" would probably clue me in that it's talking about real life, and doesn't necessarily have anything to do with the actual game other than it having the same material name.
I think it's important not to drain a wiki of all personality. Wikipedia is a place that is scavenged dry of personality and I can't stand to go on there for more than the absolute minimum time necessary to find out what I was looking for. Some people are fascinated enough with straight knowledge to sit down and read through an encyclopedia for an hour, but I just try to find out the symptoms for something and hit a wikipedia article like the one on "acute stress reaction" and it's useless because it's so devoid of anything related to what an actual person would say, rather than a practicing on-the-job professional (one who's not trained to deal with non-medically-educated clients, at that.)
I suppose you could say "well the wiki isn't there to entertain anybody, it's to teach you how to play the game/provide information." But I say information on the community mindset is just as important as information on the game.
Like The Grim Sleeper said, I didn't start playing this game because of its complexity (in fact I was totally floored by the complexity the first time I was introduced to it without story, and gave it up very fast as entirely uninteresting and even tedious.) I stayed because it's such a deep game, but my attention was first garnered by the stories - Boatmurdered, wiki articles talking about man-eating carp, forum posts about how somebody got an adventured killed in the most amazing ways possible. By the fact that the game had a community (that's the one thing that keeps me playing games a lot longer than I otherwise would.)
Edit: Wow, that was a bit of a rant. Haw haw. So
TL;DR: Wikis that contain more than the bare information, as long as they're organized, are awesome at making people want to play, rather than just telling them how.