Because Amiga.com isn't selling AmigaOne machines, Eyetech is. It would be like Microsoft having a Compaq computer ad on it's site.
This way Amiga Inc has nothing to do with neither AmigaONE nor OS4... Which makes a bit false analogy.
It's like Compaq having a motherboard called MicrosoftONE. That'd be a better analogy IMHO.