That argument is a canard.....ok tell us what country you are talking about and we can break it down from there.  Right now you are misleading people as they all have different systems.   In England you are contractually bound to 40 hours a week on salary before two tier.  Doctors here would revolt on this.  In the Netherlands, "The law requires that all Dutch citizens over 18 buy private health insurance (and their employers contribute to the cost). The market is heavily regulated in an attempt to achieve access and equity goals. The rub is that private health insurers must offer coverage to everybody and cover almost everything. This means private insurers can't cherry pick the healthy and wealthy."

"When the Cambie challengers and proponents of privatization speak of a two-tier health care system, they insist there would be a free public health-care system left behind with just a small private tier on the top. That is clearly not the Dutch model."

Greed greed and more greed.