This! What is never fully explained is that in order to enter the US on a visitor’s visa, the foreigner must show that he/she has first enough money to support themselves here while on vacation (the immigration officer might actually need to see a bank balance or money in hand) and second that they have a life they will be returning to in their homeland; a job, apartment, etc. If the person trying to come on a visitor’s visa has no money or established “life” in their home country (like most of the foreigners on this show) they will never be given a visitor’s visa/entry, as US immigration assumes they have every reason to try to overstay their visa and maybe work illegally, etc. The one exception that springs to mind is British Jon, who was denied because of a criminal record, not income. There are some interesting reality shows on Netflix called Border Patrol (I think) following officers in the US, Canada, Australia and New Zealand, and visitors trying to enter any of these countries are routinely sent home because they do not have the means to support themselves while visiting or a compelling reason to return to their homeland.