I don't remember that vote. I like to cause debates so here goes =)
So remember that POTM where it was a tie and then one person conceded. What if the person who conceded entered their picture in the next months contest. People would be discouraged to enter knowing that they prob can't win. I know I wouldn't waste a great picture (not that I have any) during that month.
alto i actually think re-entering a pic doesnt help that person even if that pic was super amazing the first time. Its only special the first time, every other time it is entered it becomes more and more plain and less chances to win. JMO.
But its a easy way to enter if you already have a good pic.