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Minnesota's biggest Obamacare insurer leaves Obamacare exchange.

A statement from the company indicated that support costs for the exchange plan were too high. "Continuing on MNsure [the state exchange] was not sustainable," the statement said. 

The basic health plans were supposed to mitigate "churn" in the health insurance market, where income changes throughout the year often mean that low-income individuals end up switching back and forth between various forms of insurance as their incomes move up and down across eligibility borders. But they may end up turning off insurers from participating by limiting the number of people who end up looking to buy private insurance.