Just months before 9/11, the World Trade Center's lease was privatized and sold to Larry Silverstein. Silverstein bought an insurance plan that covered terrorism. After 9/11, Silverstein took the insurance company to court claiming he should be payed double because there were two attacks. He won, and was awarded double the money. $4,550,000,000 dollars.
The memorial cost a mere $700,000,000 in comparison, leaving Silverstein with $3,850,000,000 and a reason for the United States to go to war with muslim countries, which eventually lead to the United States giving Israel over $233,700,000,000 in financial aid. Never forget.