The banksters and the Chamber of Cronies remember what Palin did to the oil companies in Alaska, and send their disinformant seminar posters out to try to mold public opinion. We have more than a few frequenting the financial threads on FR.
Palin is simply too straightforward for DC, anyway. No one who speaks her mind so freely is going to be allowed to play with the big boys - and without a fair amount of big boy money, winning the nomination is simply impossible.
That’s as good an explanation as I’ve seen yet.