I once saw a a tv piece on Tommy Lipuma (sp?) in which George Benson told how great it was to find a producer who would let him sing. Is it possible that Nat, George and even Ramsey liked the kind of music that coincidently made them rich just as much as they liked playing jazz? Hangin a very little bit with Benny Carter I realized that he appreciated a much wider range of music than I did.
(OTOH I remember reading a piece where someone talked about how embarrassed Wes was by his more popular later recordings.)