These people don't want to move because they value community and social support over economics. This attitude is baffling to HN because it defies quantifiable metrics unlike money. Seeing everything as an economic problem is the essence of greed.
There's nothing "greedy" about trying to formally model a situation, which is what seeing as an economic problem is about.
In my experience, people who call others greedy are expecting others to do something for them while giving nothing back in return. Economics means A gives B something B wants in exchange for B giving A something A wants. People who oppose this seem to think that A should give B something without B giving anything back in return.