Because not every comedian gets to say that they have that, that they have something that has resonated with so many people, and that these people will then pay their hard-earned money to come and see you perform live.
If the first one failed, you really want that second one to succeed, because the amount of blood, sweat, and tears is so daunting that you just never want to have to go through that a third time.
This not only encourages unethical labor practices like sweatshops to keep the manufacturing costs low, it also ends up affecting workers and companies in the US.