No. It is not worth it. The shock absorbing effect that carbon offers does not apply in the vertical orientation of a seatpost.
You will not notice a difference, even though some say they do, I sincerely believe they are kidding themselves. I rode on a USE Alien carbon post for a few years before getting disgusted enough with the adjustment mechanism to trade it on a Thomson Masterpiece aluminum post. I could not discern one iota of difference in the ride characteristics.
It doesn’t matter if you have a carbon bike or an aluminum bike, I am willing to bet money you can’t tell the difference in the seatpost.
Playing the Devil’s Advocate for a second: Perhaps you are the one who is kidding himself. (no offense, just offering another view)