The island’s working age population has fallen by a third and has the USA’s highest share of elderly. It has several times the municipal debt per person than the highest US state, and it looks like Congress will not let it fully default. It is quite possible the cheap land you might buy has negative value because rents will not cover tax and basic upkeep.
Despite being much poorer than the mainland, wages are higher than other islands, making tourism and agricultural uncompetitive.