He nodded, a sad look on his face for a moment but it soon brightens at her words. "That's true! You don't buy friends."

He hopes. There better not be people who buy friends. He thinks that would be a very bad thing to do!

"So that's good! And we didn't need to buy this ocean, we can enjoy it just like the fishes!"

Because fish clearly didn't pay to go to the ocean, it was where they lived!