Why indeed? If you wanted a small (6-7m) Ferryman for personal use, and you NEVER wanted to sell it again, I'd say why not? A friend has a 6.5 and it's a fantastic, sturdy rib with excellent sea-keeping qualities. The hulls are splashed Rapiers and bear a striking similarity to some of the smaller Parkers

. The Fisheries College in Greencastle have a very nice example that they use as a safety/training boat - they don't seem to be sweating it too much.
The problems seem to have arisen when Ferryman "stretched" the design out to 9m without additional structural support in the hull - a disaster that rightly sank the company, as well as Big Yellow.
I have heard that existing Ferryman ribs cannot be coded without belowdeck inspection (gutting).
MAIB report
*cough* Redbay *cough*