Heheheh...I cannot take credit since it was Orion that made the original suggestion...I was just agreeing with him.

OrionN
The other things is that we should not prevent people from entering. So what if someone won before in the year. We should open it up for everybody, every month. This way we get the best pictures. If we want this to be a true contest and the best picture win, then have minimal restriction, both for the subject the photographer.
Perhaps you should bring it to a vote and see what the members want. Who knows...maybe the other rules take care of one person winning so often. Heck, if it were up to me it would be open to web members too.