if you have the money for a carbon stick, why don't you just go ahead and use it on a boat that has one stock like an I20 or I17R?
I sail a 5.5, and have had those exact thoughts. Since they go for 2-3K, and a decent condition 5.5 uni should sell for 4K....
For 7 or 8 you can certinly find a I17R. Have a newer faster boat, and all the goodies.
If we could find carbon sticks that were 1000$, it'd be a different story.
If I remember correctly, a alloy stick'd uni won the nationals a few years back as well...