Why no high-intelligent people make a contract
Kyubey had watched someone for some time now. The one had a great potential. Her karma was unlike others. She certainly would become a very powerful witch. And they would gather great amounts of energy. So, after watching the girl for quite some time Kyubey decided to actually meet her.
Tanaka Akira was her name. She was an unusual girl in a very usual environment. She was high intelligent and had a strong karma. Kyubey knew that he had to be careful if he wanted to convince her to make a contract with him.
Akira herself met Kyubey on a sunny Tuesday in April. She was first startled to see a white, cute looking cat with two ears.
"Hello, Tanaka Akira. I want to make a contract with me to become a magical girl!" he said.
"So… how do I make a contract with you?" Akira asked.
"Well… I will grant you any wish you want."
"Any wish, huh?"
"Yes, any wish!" Kyubey empathized.
"Okay! I wish to have an endless amount of wishes!" she decided.
"That's not possible."
"Why? You said that I can have any wish I want! So, I wish to have an endless amount of wishes!"
"That's not how it works, Akira. I can only grant you one wish."
"Oh… Then I wish to have the ability to wish an endless amount of wishes!" she said with a big grin.
"That is also not possible."
"Hm… Okay then! I wish to… be someone who can grant me an endless amount of wishes!"
"Why do you keep insisting of having an endless amount of wishes?" Kyubey questioned.
"Why not? Having only one wish would be a waste. If I have the chance of getting an endless amount of wishes then I would be very happy! I could wish to become famous, I could wish to have endless amount of money! I wish to become immortal! I wish to get a boyfriend!"
"I can grant you those wishes."
"Alright… Then I wish… Wait!" she stopped herself. "What's the catch?"
"What do you mean?"
"This contract is too good to be true. I've watched several animes with similar contracts and they all demanded something in return. So, what do I have to sacrifice for my wish?"
"Well, it depends on your wish. Your hope eventually becomes grief."
"And that means?"
"You will become a being called a witch who will spread despair and disaster." Kyubey explained.
"No. I don't want that! Get out of here, you stupid trap!"
"But consider-"
"GET OUT OF HERE!" she screamed causing Kyubey to disappear.
And since that day Kyubey/incubators never attempted to make a contract with someone who was highly intelligent.