Well, Let me expand this a little.
I have known several high grade Japanese, even in recent times. They are kings in their organisations.
I need a seminar. I pay 500USA a day (incl non teaching and travelling days), or I pay 500EUro, or 700USA (both incl travelling and non teaching days).
a 2 day class will cost me a minimum of 4 days = 2000 - 2800USA just for fees, and then add flights, hotels, meals, entertainmen, venue rentalt etc. We are now up to 5000 - 7000 for an average course. We get told about kihon, and more kihon. They will not let people sit at their table, and in fact some will not go with a group party. They demand gifts, expensive wine etc.
This is the average in my experience, not the exceptional.
Then I go to the other art (Iaido), with open eyes, but expecting the same.
3 x 8 dan senseis all get paid 50 Sterling (80USA) each per day, stay in dorms, eat in canteens etc. They teach, and they assist. They party, and they chat to all.
Who is right and who is wrong. Both sets of martial artists.
IMO Karate breeds arrogant money making characters.
We the karate-ka created them, as we paid their predecessors such homage. Now we suffer financially. The dojo kun is a scroll to hang on a wall, according to these men,as certainly there is no humility in making big money.
The student body created these men, and they now walk the world like royalty. A bit like a footballer r a movie star. Yet their classes are the same as they have always been. There is no real progression in their teaching.
Some of the westerners now copy this attitude.
High grade and status breed an attitude that does not befit the alleged humility of a karate-ka.
If there are others out there who are normal humans, then I apologise. But in my 40+ years around these men (including some westerners). all the high grades also carry a high ego.