Queuing up early in the morning to buy limited-edition sneakers, someone called out to me: "Bro, 500 bucks, give me your spot."

I ignored him.
He increased the price to two thousand.
I said nothing, took the money, and left.
He happily stood in front of me.
Three hours later, the clerk announced: "Only one pair left, size 40."
He wears size 45.
His face turned green.
I took out my phone, the official website just restocked, free shipping at original price.
And I made two thousand profit from him.