In today's US, very few people vote in local elections or participate in local politics whatsoever. Most people can't name their Reps, Senators, Treasurers, Councilmen, etc. These people are not shaping national culture. Sarah Palin is. Palin has more influence on the general beliefs, attitudes, etc. (like Rush and co.) than a majority of those presently tasked with legislating.
She may not be voting things into law, but if she influences those that do, or more realistically, influences those that elect those that do, she's having an effect. And, I don't think anyone would suggest that there's anything about her that makes her exceptionally qualified to be in the position she's in....even if she's unemployed.
But, the spirit of what you say is true. It's worthless to fixate a bunch of ire and hate towards her.