Why are machines so cheap in America?

The USA operates on a subsidized market with their machines tailored for American citizens and aren't meant to be sold in Australia.
Despite any claims by suppliers, machines bought online from overseas or unaccredited providers come with zero warranty in Australia and are not eligible for health fund rebates. On top of that, we're also advised against altering or tweaking settings for you. This means if you encounter any warranty or setting issues, then you are stuck having to ship your device back to the USA.