Well let me add to this long thread, just got a message from someone in the North of Thailand, who went to renew their retirement extension based on 800k in the bank today. Things to note, person was also required to do  90 day reporting, despite it not being due. Extension was granted and friend was told that  1) Must have 800,000 in the bank when  does the next 90 day report. 2) After that 400,000 baht is required. Also given a copy of the rules, as per the OP here.  
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