If we accept, for the sake of argument, that your reading of the law is complete and correct (and I have no reason to doubt that you are correct), then wouldn't it make sense for Palin to amass a personal "warchest" to ensure that she can cover any related legal fees if she was going to actively run and invite such suits again?
The point is not that having to reply within twenty days to each accepted complaint would hurt her financially (although I'm sure that this would be a concern).
The point is that each filed complaint, whether accepted or not would become front-page, evening news, Sunday morning headlines.
Each new complaint would give the media the opportunity to resurrect all the old stuff (in the interest of context of course.
Further, each would give new life to the quit story since this was one of the reasons she gave for doing so.
It would be Swift Boat on steroids and would effectively derail a Palin(tm) campaign.