Cynical response 1: This is part of Palin's gearing-up for the next election. There, too, she will seek national attention not necessarily for the presidency, but for the name recognition it will bring. She will claim to be a woman of the people. Of course, the endeavor will be largely financed by 6 figure speaker fees and their attendees.
Cynical response 2: Low six figures isn't much for hedge fund managers, and getting a speaker with this much tabloid appeal is hard without drawing embarrassing amounts of attention. The Donald is, well, too smart. Paris Hilton, too flashy. So we're left with a D lister who's been quiet but can still pack a house.