For an attentive audience like the Monarchs. They have the good looks for selling. Jack sees this will ruin the narrator as an artist who is not able to flex from the real world to the art world. Art review leads to bad things about the art and the artist. Narrator tells the Monarchs that he cannot be ruined because of their problems.
Monarchs come back because they only have the studio as a reality now.
They want to be good guest, so they do things they know how to do - make the household run smoothly. Mrs. Monarch serves tea to Miss Churm - role reversal. She also fixes Miss Churm's hair - transfers her illusion of gentility that she cannot convey in art to someone else. Shows reality is a problem. Untransformed by art, reality is useless, unpractical.