Does keeping the premium low actually mean that the other employees already paying into the system are most likely picking up the slack? The employer part is being picked up by the EI fund, and the voluntary premiums are kept lower. That means others are picking up the slack for the self-employed. In other words, it's not self-sustaining, because there's not a collective risk.
Evidence of meeting #59 for Human Resources, Skills and Social Development and the Status of Persons with Disabilities in the 40th Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was amendment.
A recording is available from Parliament.