@Bill
As I understand it anyone can contact Amiga Inc for a license/Certification. By that I mean - If I decided to buy 5000 of mobo X and I met all of Amiga Inc requirements (technical docs/sales forcasts etc etc) then OS4 would be ported, and I could sell mobo X with OS4.
Now the deal is that I would provide the first line support, not the manufacturers of mobo X.
[EDIT]
Therefore those people that want mobo X with OS4 buy it from me, and those that don't buy their mobo X from someone else.
That way you don't pay for OS4 if you don't want it.
[/EDIT]
Rassilon