This is a "Dog-eat-dog world" you know! He who gets to the reservation hot line first wins the spot! Some plan very aggressively. Some are just not so aggressive and they loose out! But, no one is breaking any rules. I suppose the best you can do is talk to your local representatives and see if the "rules" can get changed.
Meanwhile, I'm just SOL for Memorial Day in Indiana because I was one of those who was just not "aggressive". When we finally decided to go ahead and go out Memorial Day week-end, well ... everything was booked! I can't blame that on all the visitors to Indiana this week-end who are coming in from Ohio, Michigan, Illinois, and Kentucky! Just because we have this little annual event called The Indianapolis 500 ... well ... I should know better! So the "tourists" beat me (the local yocal) this year! Next year ... well ... I'll just need to reserve a campsite earlier! (It will probably rain anyway ... it seems to do that a lot on race day!)