Hey guys,
I try to keep things light hearted. Seriously though how many CAT II approaches have you been required to do. I've been, but am not currently CAT III qual'd and in the four years it was maintained it was used only once.
As has been stated prior the requirements are very high to maintain.
Also for the example of going to TEB there are about a dozen airports a stones throw away from TEB. There are plenty of other places to choose from that may have better weather.
I can tell you that the vast majority of operators do not train to CAT II/III standards. Larger companys might, but not even all of them do.
Falconbis, what did aircraft do before CAT II/III standards were approved?