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Imagine, you are hitting 300,000x multiplierSuddenyl, KYC things happened and required you for complete it with level-4. If the person came from Asis, there has some high chance we can't completed it and the balance are stuck because you know in asia we are still like living on our parents/family hous, etc (not under our name).
I more happy with 5,000 and withdraw without problem, especially KYC.
True. I had a similar "problem" with pokerstars. They wanted an address verification because I changed it from Germany to Japan. Sent documents of bills and so on, all denied because they were in Japanese. What do they expect?
When you live in a country you get the documents/bills in local language. Sites should see it for what it is.
In your case with pokerstars, if I had to guess on what happened. I would say that the customer support agent likely had many tickets on them and when realized your documents were in Japanese just did not care or mind to translate or move the case to someone else who could have solve it instead.
If there is something I have learnt from friend's experiences is that having and keeping a proficient costumer support team can be difficult. It is a tiring and ungrateful job because one deals only with people who are likely mad or impatient, that would affect anyone's mindset eventually.
That is why I try to be gentle when dealing with them.
but I just don't see the "economic advantage" in such a gaming activity. 
