The Nationals problem is they already sold out their constituents long ago, so now they don’t have enough people to actually give them any power because yeah they would be fucking ludicrous if they got any in this day and age.
They've been selling out consistently since the 1920s, shamelessly, but they still hold seats. Unfortunately their vision is still popular among farmers. "The Board will do all my paperwork, transport and marketing for me, certification will magically handle my quality control issues, and the police will suppress those labour unions and keep wages low. I'll just have to drive the tractor and watch porno all day..."