I absolutely love it! My former boss and good friend (over 65) just got his black belt in karate. We were trying to find out what the record is (age-wise) for getting a new black belt. He is my sensei in every sense of the word.
It is obviously a "trick" domain, but I am confident you could find others that appreciate things like this.
I am really hard pressed to set a value here, but I do think there is value... and yes, had I thought of it I would have registered it!
Marc