the chances are that Committee members don;t actually win more than other members, on a game-by-game basis, but by definition, they are at the club most frequently, so thje law of averages dictates that they will win more often simply because they play more often - and that is simply matehematical chance.
People do tend to notice and remember more if a Committee member wins, so it adds to the impression that they win more ofteh than they actually do.
If anyone has concerns, start keeping accurate records of games played and winners' stats, that should stop tongues wagging.