I couldn't agree more dwditty.
I've seen tremendously talented musicians who lack the ability to entertain and average players who can bring the house down.
It's ok for the out-and-out muso-types (like me) who will happily watch a great player do his introspective thing with scant regard for anyone else, but there's a whole world of people who, quite rightly, expect the person on the stage to entertain them.
But we're talking on a more professional level than floos singers and open-mic nights.