I know an NQA certified judge who recused herself from judging a quilt that she knew to be a kit. The judge herself had designed the quilt, had selected the fabrics and had sold the kit...no way was she going to judge it! She did NOT tell the other two judges until AFTER the judging was completed.
This was at a show that, because of copyright concerns, requires you to have written permission from the designer of any quilt you enter that is not your original work...something that is more and more common for shows and even competitive challenges such as the Keepsake Quilting challenges.