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Okay, but other species aren't even able to pay to exist. If a human wants them dead, they dead —unless they the property of another human being of course.
You act as if paying to exist is a privilege. It is a requirement of being a human in our society. A requirement that functionally requires you to be exploited by those who won the birth lottery.
It is a privilege in contrast to other species, the exact juxtaposition done by the OP. It's like complaining that the free man has to pay for room and board while the slave doesn't. I've heard exact arguments like this from slavery apologists, that slaves had it really good actually.
How exactly are other species relevant to how we structure our society? It is true that humans are the top dog in the circle of life, but how is that relevant?
I said nothing about slavery, why are you changing the subject?
EDIT: I guess I missed the first sentence in the OP about species. I think caring about how other species do things is just a red herring to draw attention.
Also, you could easily not have to pay to exist. You'd just be living a hard hard life out in the sticks or be taken care of in jail with the tradeoff of a lack of freedom.
People in prison are hardly taken care of. Read up on healthcare in prisons, for example.
Taken care of was not the right phrase, only in the sense that you'll keep existing for no money. Quality of life for a free existence is not going to be pretty any way you slice it.