I am more than willing to put carbon components on my bikes. The seatpost isn't one of the places I'll allow it. When I can get a Ritchey WCS alloy, 1 bolt post at 195 grams (advertised), I see no real point in going with anything carbon. My older WCS seatpost comes in around 240 grams I think, and that's the 2 bolt version.

I watched some poor guy in a road race last year have to ride a long portion of the race with a broken carbon post.