Even the most elaborate of wikis (TWiki, to pick the one I'm most familiar with) are pretty simple to set up; I can't really see using a service like this for anything beyond experimentation. I also don't see any hint of a business model on the site, so they could vanish or start charging real money at any time.
Most cons already have a website, so for con-running the obvious thing is to set up a wiki there, using whichever of the popular engines fits best with what the site is using.
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Most cons already have a website, so for con-running the obvious thing is to set up a wiki there, using whichever of the popular engines fits best with what the site is using.