The poorest tourists simply don't have the economic clout to transform their destinations. They have to learn the local culture and language, even perhaps studying them before they arrive, to survive and get around. They stay in the places local people stay, eat the local food, and use the local mass transportation. Having more time than money, and being more dependent on local goodwill, they are compelled to be both more patient and more tolerant. They can't afford to change things much, and they leave them pretty much as they found them.