Put off by the alleged long term effect of sunlight on black tubes Alex, plus the slightly ridiculous "look at me I'm in the SBS" look. Is there a RIB equivalent for "let's off road"? There are striking similarities between the number of drivers who buy 4x4s and can't drive them and the number of people who buy RIBs........
Also don't like the Humber's transom (lack of splash well). The best RIB I have seen was Arnaud de Wildenberg's Valiant in commercial spec, but even he has changed to a large hard boat now, a Predator I think, as he is fishing more and more offshore. I heard a rumour that he split the heavy duty aluminium boat he had before the RIB, but he fishes in seas that you wouldn't believe. Not even the hardest guys down here would risk it, but there again maybe he has less tide to cope with.
For your average requirements you probably won't beat a 16' Strikeliner in terms of practicality, adaptability, ease of launching and handling and economy, especially with a 20 or 30 hp modern four stroke on the back. Good resale too and nothing to go pop and hiss either at sea or on a dark night in a carpark.