I think I understand Jonathan's point, because it bothers me some as well. Sure, moderators will either ignore or (preferably) delete entries, as Don seems to be doing, but as a photographer, if I have an idea I'm working on and then see someone post something similar, I may trash that idea and move onto something else. If the photo posted was outside the limits of the contest, I may still abandon mine because I do not want to draw comparisons or potentially be thought to have "stolen" someone else's idea. The plain truth is that someone's ignorance of the rules, willful or accidental, can impact the entries of others in the competition. Were the entries submitted by email and not revealed until included in a single gallery by the moderators this wouldn't be a problem (not that I'm suggesting this method). But as is, the presence of disqualified entries has the potential to impact future entries by another photographer.
I know, it's a friendly little forum competition, but we all want to do our best and see how our photos stack up, and when you attempt to play by the rules it can be frustrating when others ignore them. Like busting your butt to shoot something every day in your 365 and seeing someone post "stuff from earlier this week" in theirs - you want to point it out, for their sake and your own, but to some it always going to seem petty, because for some rules were made to be bent when nothing "important" is at stake.