And why wouldn't somebody who works hard to develop high skill pursue high rank? Provided that they train in a system that uses rank, I would think they want to see the results of their skill and hard work which comes in the form of rank, at least if they're training under a sensei that I would train under (somebody who makes their students earn their ranks instead of handing them out or selling them). For such a person to not pursue rank, it would be like a boyscout who works hard to live up to the scout oath and the scout law and to be a good scout but who doesn't pursue rank in boyscouts. True, you can be a good scout and not have a high rank such as Eagle, but it makes sense that somebody who works hard to be a good scout would want to be an Eagle Scout, that would be the proper result of somebody being a good scout.
As geezer said, why not just stop worrying about rank. I further agree, that the arts are not the boyscouts. And believe it or not, there are some people that just don't care about it. They're more interested in training, learning the art, and getting good at it. I've said it a million times, and I'll say it a million more...the belt is not an indicator of skill. Just because someone wears a BB, doesn't mean they're worthy of that. The same can be said for a green belt, a blue or purple. I have my 4th degree Black in Kenpo. However, I'm no longer active in the art, ie: training under a teacher, but I still work my techs. I mean, after a certain time, rank advancement is simply time in grade. Once you reach a certain rank, there are no more techs, or kata. And who really needs more anyways? By the time you reach the upper BB levels, you should have quite a wide array of material to work on. Is learning 1 more tech going to make or break you? LOL!
I asked one of my Arnis teachers one day, after a private lesson, what there was to learn after black. I should mention that I do have my first degree black in Arnis. His answer: Not much. Just making what you already know, better, and expanding upon it. And ya know what? He's 100% correct! I've worked out with other FMA guys, and we've taken 1 or 2 of the basic stick disarms, and just drilled the hell out of them, exploring, and finding new things. My teacher gave me the tools to do that. Now its up to me to take those tools and apply them. He's not going to spoon feed me, nor do I want him too.