Well its really more like, everyone pays into the pot (now as a tax, presumably) as a security blanket. If you get sick, the care is there. If you are not, you pay in until its your turn to use it. Everyone will need health care at some point or another. At least, thats how its done in most of the other industrialized societies that already have health care. You have to have the young and healthy pay in when they don't need it, or it just won't work. Then when the young become old or sick, other young and healthy will continue to work and pay in and so on.