The wonderful thing about acting is that you can use all of your talents and interests in your work.
People or philosophers keep saying that our fundamental objective in life is to be happy! This is wrong! Our fundamental objective in life is to exist, either happy or unhappy!
Money is part of how we move through the world, what stores and restaurants we go into, whether we take a train to the airport or a taxi. Describing characters living in the real world requires describing them engaging with money. There are also so many emotional aspects to money - feelings of inadequacy, feelings of security. I am not sure if there needs to be more about money in fiction, but the absence of this aspect can make a story feel somehow frictionless and unreal.