Well my thought is that on these boards an event like this is well publicized and many people interested and ready to buy. However, though there are many people who frequent these boards, we are probably still a small population of overall Disney guests within a year.
So, though we may think this event will sell fast, probably the general public at large has no idea that it's happening or interest in spending more money...and that get's me hoping that it may not be as overly crowded as we anticipate.
Also, this may be a last-minute purchase for those who will be visiting Disney that week yet are not aware of this event and probably won't be until they arrive.
I'm sure we're all hoping it won't be overly crowded, but unfortunately we won't know until we get there. I was just thinking that this would be a very popular event for locals and if so, maybe they won't buy tickets until day of or day before event. Who knows...