Here is an interesting side question: What do you think about individuals with no Hapkido rank being promoted directly to a dan rank after learning from things like seminars, private lessons, or those with previous Hapkido understanding, and no rank?
Rank from seminars only: This was common in the early days off Haedong Gumdo when they were trying to get it off the ground.
Frequently, the individuals in question held some level of rank in another art or arts and were looking to add sword work to their TKD program. This is probably the case with people doing the same with hapkido.
The major difference is that hapkido is already off the ground and does not benefit at all from this practice. Someone is making money, pure and simple, otherwise they would never offer rank after a seminar.
Rank after private lessons: If a student has been taking private lessons and holds no rank, but comes into my school and is head and shoulders above everyone else, go ahead and promote him.
Rank with previous hapkido understanding: This would be kind of like myself with taekwondo. I took taekwondo, karate, and TSD alternatively from about seven through about nineteen, then got into sport fencing. I started to get back into taekwondo, but then my first child was born and I had neither the money nor the time. I started back into taekwondo three years ago at the same place that I take (and now teach) kendo. I started as a white belt again, but moved fairly quickly, as I still had retained much of my previous training. But had I been given dan rank quickly, I would have raised an eyebrow. It would have been inappropriate.
After taekwondo for awhile, I took up hapkido under the same instructor. His taekwondo class had a fair amount of hapkido blended into it. Thus, I had a pretty good handle on wristlocks and arm bars by the time I signed up for hapkido class and needless to say, I could punch and kick quite well. I still started as a white belt.
So in short, I feel that if you are starting a new art, or starting back after years away, start as a white belt, and the school should promote you according to your ability and progress.
Daniel