Ghost Gunner
The "Ghost Gunner" can make other stuff (it is described as "general purpose"), and other CNC mills can do the exact same thing. It was just user-friendly for the purpose of creating lower receivers out of unfinished "20% lowers". It may have been overpriced and thus should be considered partly a donation to Wilson.
The products that Wilson sells earn him money to fund the legal fights that inevitably ensue. The end goal is to get a favorable Supreme Court ruling.