I'm very keen on writing competitions as my students well know. A listing of any sort should be added to the CV because it demonstrates a high level of competence. Don't forget that if your story doesn't win one competition, it might well win another. I know this to be true! Placing depends on the judges preference, you don't have to cross the line first or keep a ball in court to win. What you have to do, is write it and send it, then perhaps go and sacrifice a metaphorical goat if it makes you feel better.
The photo's rather blurry but when Sophie won the Luke Bitmead Award for her novel The Generation Game, she said the whole evening was a blur. She has since had two novels published to acclaim.