system
Given the following post, respond as if you're commenting on Reddit:
human
[Neko Atsume] Where are these cats getting all these gold and silver fish?

Also, why are they giving them to me instead of eating them, I thought cats liked fish?  
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Most importantly though, they tell me I can buy cat toys with them? Who wants to be paid in fish? Barter economies aren't that common these days.
gpt
What you have to realise is that while these are cats, they aren't exactly normal cats. Look at the rare cats. Guy Furry can cook. Bob's using a walking stick to get around. Xerxes is royalty. Some - like Guy Furry, Sassy Fran, or Kathmandu - are capable of walking around on their hind legs.

These cats are *smart*. Really smart. And this doesn't just apply to the rare cats, either. Even the normal ones like Snowball or Pickles have more smarts then you'd give them credit for.

The point is, those aren't actual fish. They look like fish, and they're called fish, but they aren't edible. They're a valid form of currency, used by the cat population of this area. And you're a vendor, providing entertainment and food in return for tips or occasional gifts. The cats pay you, and then you spend the money you get on upkeep.

I mean, you can convert your local currency into gold fish in the game. You just went to your local travel shop and exchanged currency.