Thing is with the F14, it is the only spinnaker boat I can think of which can reasonably be campaigned by one person i.e., be loaded on and of the trailer, rigged, launched and retrieved, and in many cases, kept in the shed / garage / driveway at home, and there are no crew hassles. They are also somewhat easier and cheaper to tow on the road than are bigger boats.
Biggest worry till now has been that 14ft cats have not been considered big enough to be taken seriously but with the much improved performance of the more recent boats, and their unique attraction as single handed boat with spinnaker, they are now a much more reasonable proposition.