Palin is not fed up with politicians, she is just spewing her usual nonsense. Her speeches are entirely to solicit contributions, and perhaps to wangle some sort of sinecure should Trump manage to get elected. She has nothing to lose, in a nation of 330 million, there are many who are so fucking stupid they believe her nonsense, just as there are a lot of old farts who have fantasies about My Little Pony to the point of dressing in horse costumes.
There are a lot of people who actually paid retail for her SECOND ghostwritten book. Those are her fans.
Again, there is no hope that she will ever be elected again, or even allowed by the GOP to run as a candidate for anything.