“The millionaire has this advantage, that he is able to observe meanness, a perfectly disinterested, pure meanness, not based on any calculations: many know very well that they will not get anything from him and have no right to get anything, but they want to be sure at least to run ahead for him, at least to laugh, at least to doff their hats, at least to wangle themselves an invitation to dinner where they know the millionaire has been invited.”