The real reason you don't see carbon/epoxy or even glass/epoxy boats is most builders don't have the facilities. A competitive carbon/epoxy boat requires an autoclave (a computer controlled pressure chamber/oven) and metal molds. A polyester/glass boat is done in open molds that can be wood or better( And NO NACRA does not make the A2 in their facilities)

The extra cost of carbon and epoxy is minimal, less than $500 per boat. It's paying for the facility that costs so much. You have to use the facilities 24/7 to make them pay. That means your whole line has to use them or you have to take in outside work. That why there is not much overlap between the polyester/glass builders (F18) and the epoxy builders

However, from what I have seen, the increase in quality and durability is worth the extra money. For example, based on Tornado experience you could build an F18 with a 10-14 year competitive life for the hulls.