Requiring proficiency in the language is reasonable, but requiring everyone to be richer than the average member of the population and have enough money banked to live off of for 30 years seems insane. That goes well beyond simply making sure that people are able to care for themselves.
If the goal is to preserve their culture I doubt that insisting that everyone who moves there have "fuck you" money is going to help as much as they think it will. At least some percentage of those who meet that bar will be people who are selfish and very accustomed to just doing whatever they want.
The more money people have, the greater their ability to reshape the environment and culture around them to suit their individual preferences. Rich people aren't moving to remote villages in bumblefuku nowhere either. Having a bunch of rich foreigners concentrated in the major (and culturally influential) cities will only make it worse.
50th percentile + 30 years subsistence is not "fuck you" money, but regardless, income has multiple effects, not only cultural. They don't want to be financially supporting foreigners, of course.
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