I was flying in the RHS as a passenger in a charter from Shompole to Wilson a few years ago. We were at 8000 ft, over a fairly solid deck, and my pilot was looking for a hole to descend. I was more than a little surprised that he had no IFR rating -- according to him, IFR ratings in his company (Yellow Wings) were rare and not a whole lot of use because (as stated elsewhere) the ground equipment just isn't there.