Paul does mention the Airbnbs did so because "they had seen the future and couldn't let go." Sounds to me like it was a calculated risk they needed to take. A

Paul does mention the Airbnbs did so because "they had seen the future and couldn't let go." Sounds to me like it was a calculated risk they needed to take. Also see Paul's point on how the Airbnbs would have given up incase "this Y Combinator does not work out."