Then you should be happy because the design of the subsidies cap health insurance costs at 9.5% of O-MAGI and cost-sharing subsidies exist for those with lower income.
For example, DS is low income and as I recall pays ~$20 a month after subsidy for a bronze level plan that would cost $180/month without subsidy. Since the subsidy is based on the difference between a sliding percentage of income and the second lowest cost silver plan if someone chooses a bronze plan then the what they have to pay is lower by the premium difference... in DW's case an additional ~$60/month (ie: he would pay ~$80/month if he had that lowest cost silver plan.
In most cases these people would go without health insurance if it wasn't for the subsidies. (DS wouldn't because if push came to shove I would pay for a plan for him.....to protect me.... I wouldn't want to see him have a serious illness and have to write out a big check for his medical bills.