Lee, I wish I could say we don't need them because we don't have any yellow jackets here---but, alas, we do have Y.J.s and no skunks.
However, I have never come across the Yellow jackets robbing bees here---there are bigger trouble makers called the oriental wasp, to whose predation I have lost many hives. I fear that skunks would keep their distance from them (even though they do nest in the ground), so I will forego the pleasure of trying to import them into the country.