Look, I could respond to each of the points you bring up in turn, and explain how it's actually quite easy for those individual statements to be true but still impossible for most residency programs to turn a profit.
But I've been on Hacker News long enough to know that, when someone begins a lengthy comment with an insult that underhanded and that personal, there's no way that they're in the mood for a good-faith discussion, and attempting to engage further in a reasoned debate is a recipe for frustration.
I see you're a relatively new commenter here, so I'll just say: on the off-chance that this interpretation is wrong, and you were looking to have a good-faith discussion on the topic, I'd recommend next time leaving off the personal insults.