Extremely red states don't care. They won't flip at all. And none of the districts are even remotely competitive. Only the primaries matter.
A cursory look says Wyoming has a population of ~580k and ~340k registered voters. The article says Wyoming has 46k people on ACA. Republicans win landslides in Wyoming (40%-50% margins) and 46k people is 12% of voters max (likely closer to ~4% at risk).
Thanks. So, the upside is saving money, at the expense of alienating poorer voters in (this example) a state where their majority is so big they don't care.
The "upside" is national-level PAC money financing your campaign.
It won’t even save money in the long run.
When people don’t have access reliable healthcare, they tend to use even more expensive (for society) options like emergency rooms and grey/black market. People who become disabled or die from lack of healthcare don’t tend to pay much in the way of taxes.