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Ads on the wiki
Most of the sites I see have ads for other independent projects. Some of the more popular sites have more mainstream ads but they're still usually relevant in one way or another, like the examples I listed before. It seems like you can manually decline certain ads if you don't want them there. It's not automated though so it might take a while for people to start placing bids depending on how many people know of the site.
It might work for the guild ads and it might not. I'm not sure how many clicks the wiki gets but if it's popular enough bigger companies might want ad space and they might outbid player ads by a lot. Maybe if you have separate ad spaces for guild ads and such.
EDIT: The people saying google ads might be more convenient have a point. The wiki is pretty niche. Though Project Wonderful would probably still work for the guild ads.