I don't follow. It allows citizenry to identify wage discrimination and other malpractices, people can get paid on the value of their work and not just how good they are at gaming the wage negotiations. Plus most of the civilised world has this thing called a "union" and "workers rights" that generally prevent your imagined scenario from happening.
What has medical data got to do with this? You can't very well go up to a disabled person and say, hey, you cost society more money, maybe you should have been born less disabled, you cost too much, pay more. Societal safety nets exist for a reason, and how much one is compensated for equal labour as your coworker... I don't see how it's related at all to the "make the disabled pay more" eugenics argument.
What has medical data got to do with this? You can't very well go up to a disabled person and say, hey, you cost society more money, maybe you should have been born less disabled, you cost too much, pay more. Societal safety nets exist for a reason, and how much one is compensated for equal labour as your coworker... I don't see how it's related at all to the "make the disabled pay more" eugenics argument.