I doubt it counts for anything or reviewers would even know what you mean. There are thousands of wikis on Wikia, many irrelevant. And with anyone being ably to edit any of them in any way they want and be considered a "contributor" there is no real level of still or experience editing or even administering one gives you. "Wikipedia contributor" would be more understandable, but would probably still be worthless.
Though that's my personal view. There's one blog post on central on the topic w:User blog:Meighan/Wiki Wisdom: Adding Wiki Experience to Your Resume.