For most customers returning to the Obamacare marketplaces this year, it really paid to shop around. New data shows that a large number of them did. That bodes well for those shoppers and the future offerings of the insurance marketplaces. More than half of people who bought insurance on HealthCare.gov last year explored their options before choosing a 2015 plan, according to a report from the Department of Health and Human Services. Of those 2.2 million who shopped, more than half switched to a new health plan. Those high rates of shopping and switching are unusual in public health insurance marketplaces.