The original commenter, Dumbledoor, speaks the truth better than than she probably realizes. Wedding Wire DOES give preferential treatment to vendors.
Wedding Wire will delete negative comments and reviews from their best customers' listings. The only negative comments that they don't remove are those of the bride. You can find complaints about this issue on the web from brides, relatives, and guests. Sometimes, the bride wants their guests and wedding party's comments on the board along with their own.
All a preferred client has to do is contact Wedding Wire and request the removal of a negative comment on their page. Additionally, Wedding Wire reviews of preferred customers tend to be displayed from the best review to the worst, rather than the date of the actual comment, so that customers do not see the bad reviews first.