Users take part and improve wikis, it's the whole model. If they don't take the adverts, they still can contribute. Googlebot isn't making edits, not even giving signal to the site about what is useful allowing the owners to hone the site.

Two ways in which issues who have adblock are better than bots.

Users will promote organically, which can win more credence than even a higher listing in SERPs. Depends if your wiki is part of building a community.