A new analysis from Avalere finds that the penalties associated with the individual mandate, which grow in 2015, might be too low to attract enrollment, particularly among middle-income, healthy individuals.

Earlier this week, the Department of Health and Human Services (HHS) announced that 68,000 people enrolled in exchange coverage through HealthCare.gov as part of a special enrollment period for individuals paying the individual mandate penalty on their 2014 tax filings. That lackluster uptake of the special enrollment period is driven, in part, because for most people individual mandate penalties are much lower than actual costs of coverage.

Some consumers are willing to pay the penalty for not having health insurance because it is cheaper than getting coverage, according to a new analysis.

The analysis from research firm Avalere Health details one reason why the administration has done so poorly in a special enrollment period for Obamacare. So far only 68,000 people have signed up for the period that ends April 30.

This is the period set aside for people who are getting hit by the law’s new tax on Americans who do not have health insurance packages. Affected taxpayers must still pay the 2014 penalty but could avoid the higher 2015 penalty by getting coverage by the deadline.

But it turns out many uninsured workers would rather pay the tax, because it will cost less than buying insurance.