I have done stamp shows for over 20 years. I have been asked for Hawaii at least 100 times. At least 95, maybe even 98 people only wanted to view kingdom. This is not completely understandable. Kingdom of Hawaii requires many tens of thousands of dollars investment for even a basic collection.
Territorial material is much cheaper and much more available.
It should be far more popular than it is. This has slackened demand for both Kingdom period and of course continues to prevent any increase in demand for territorial material.