> As a former user of that system, both original owner and the new owner have gained
> experience from having used it while only one registration was sold.

Yes, but not at the same time. If a registered system is sold to a new user, the old user becomes a former user of that system, so there's still only one user of that system at a time.

> So, yes one active user, but two that gain from one registration. [...] Pretty simple from
> my point of view.

Seems your definition of what a user of a system is differs from my definition. After all, there aren't millions of Amiga users out there, are there? ;-)