http://www.forbes.com/2010/03/25/why-people-go-bankrupt-pers... Here's a citation on the bankruptcy statistic. Its corroborated by many other sources (and many other studies).

No matter what your intentions on the topic, if you end up in the emergency room for a preventable condition (which will lead to more treatment), you will end up costing everybody much more than simply taking the vouchers... take that fact as you will, but statistically speaking it's very likely you'll end up "costing" society more by not participating in the healthcare system.