Society, in general. In essence, Shakespeare aims to say we are all just pretending in front of other people, like a facade. We will have our moments and our downs. The “one man pays many parts” can be how a person can pretend to be something they are not to get others to like them. Like trying to fit in one group, you’ll pretend to be into what they are or etc. Can be applied in the dating scene, friendships, work and other forms of social life.
Because he thought it would be a good idea
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In "The feather pillow" by Horacio Quiroga when the parasites don't have a human to feed on they usually are small, they are parasites of feathered creatures. This parasite, in particular, has been feeding on Alicia's blood, that is why it became so monstrous. We learn about this in the last parragraph of the story.