“Le superflue, chose très necessaire”. The superfluous, a strictly necessary thing, according to Baudelaire... And in fact, he was right.
How many times do we give into temptation and buy a new item of clothing just because we like it, even though we know perfectly well that we don't need it? How many times do we order a dessert, even if we have eaten enough, just for the pleasure of tasting it.
These are the little treats in our daily lives; human nature is to enrich life with little things.