The problem with carbon masts is price. You just don't want that much money to snap.
The answer is in your budget and your desire to win and right easily.
More time on water will create more speed than a new mast though.
With all things there are postive sides.
Race freaks need a steady class rule so the fleet is big and even.
Tech freaks want development like A class.
The boats should be picked accordingly.
If the mast has to have weight placed on top it is not worth having as the advantages are gone and costs and risks are more.