Not quite true. If you own the providers, getting people to pay deductibles and copays (i.e. getting treated) will yield way more money than just having them pay premiums.

The insurers are legally obligated to pay out 80-95% of their premiums for treatment. So the only way to grow profits is to spend 2x and much and charge 2x as much. Sure you only make the same 5-20% margin, but it's on 2x the revenue so it's 2x the gross profits.