Sure, “Skin Fruit” includes several outstanding artworks by significant talents, and there are a few genuine surprises. But whether the artists are 1980s stars like Mike Kelley and Cindy Sherman or relative newcomers like John Bock, Nathalie Djurberg and Dan Colen, nearly all are well-known quantities in New York, widely supported by other museums and high on many collectors’ must-have lists. Nearly all emanate from one stratum of the art world: the one where the money is.