I understand the worked example is just an example, but I guess the numbers give
an idea of what the authors of the paper have in mind.Based on this, I think that
for some registries that may wish to switch from one class to another, the change
mey be too abrupt. For instance, in Chile we currently would be "country", because
we require a local presence, or at least a local contact person. This means $5K as
fixed cost. But we often discuss about lifting this requirement, not to market .CL
aggressively worldwide, but simply to make life simpler to foreign registrants. But
this would turn us instantly into a "worldwide" registry, at the $50K level.
Perhaps
this abrupt distinction can be replaced by something depending on the percentage
of in-country vs. out-of-country registrations for ccTLDs, while for gTLDs all registrations
would be considered out-of-country. Just an idea.
Patricio Poblete, NIC Chile