(I was already working on those instructions when the pricing change reached our attention, so it became a viable free alternative only by coincidence, but still.)
One other thing I learned: HN crowd is biased towards people who want to learn and understand their tools to a degree. Workplace use of Docker has large component of people who don't know what Docker is for and don't really care, but they need it for some task, so they want a hassle-minimizing option they can use to get their job done, and then forget about.
I bet it's a huge market, not just for Docker, but any other software tool. One that's somewhat alien to the HN audience.