Because it always fell before the SX season was over. Usually the week before Daytona. The riders and teams didn't like to have to change all of there setup for just one race and then go back to SX settings. Also if a rider was injured during the SX season at the time of Gatorback, then he was screwed for the outdoors before it even started. It made sense to not have any Nationals before the SX season was over, but not to scrap it all together. They should just schedule it later. There is probably some reason they can't. Might have something to do with MXA. Also, they have to cram as many nationals around the New York/Pennsylvania area as possible. We could certainly use a few more National around the country, such as Texas, Colorado, Montana and certainly Florida.