Well you should have said that in the first place making me waste my time sending you a perfectly good PM !
Slim Tim seems to have a cost effective solution, using one of Steve the Boats hulls you'd probably find a lot of information re the comparitive costs of Ribs V Hardboats on Mr. Fullers organ. A humber hull only starts to get dear when you have start adding the bits On but a bare hull and tubes is attractively priced
Apart from the costs what surprises me is the length of time a RIB takes to fit out after it has been tubed and how much money is tied up during that process.
Also I guess the hull for a hardboat is no more dificult to produce than a Rib hull, but you don't have the expense of tubing. So yep I agree that Ribs are pretty pricey for what is in fact little more than a dinghy with an Ego