Who was wrong here?

this.

This

>complain about Reddit
>"le this"

Seconding this.

If a knight orders you to give him your strongest potion, you give him your strongest potion.
Sure, warn him about the dangers, but still give it to him. He's the one in charge here.

Why make goods you can't sell

What if the potion seller is actually the king, and he just makes and sells potions in his spare time?

He's just poking fun at his favorite knight, taunting him. His potions aren't even that strong, he just tells everyone they are.

Basically. How is the potion seller in business if he only sells makes potions suitable for the strongest of beings?

Well, in that case, the knight is in the wrong. No need to get salty over a little joke and call the King a rascal.

Because he is the best potion maker in the land. The greatest of beings come from far and wide to aquire even a drop of his powerful potions.

The knight that we see is a weakling. Wasn't even good enough to just take what he wanted. He got rekt by a non-combat npc. He doesn't deserve the potions of power.

Look up artisanal markets sometime.