User blog comment:TehAnonymous/TehAnonymous AMA/@comment-6006137-20150120103420/@comment-1990160-20150120130524

To rehash previous points:
 * Custom Champion creators generally (like ~98%) do not edit mainspace - they do not contribute to the "wiki proper"
 * Custom Champions do not improve the quality of the wiki
 * As an overall concept, it is based on the principles that all individuals have original creative ideas, and that they understand balancing. These are things that are not always true.