Simply not true and you cannot provide any evidence to contradict me when I say your guessing. The requirements and price of a DTV extension is currently unknown.
nothing you have said is factual and can be backed up with evidence. Of course the RTP set the rules and pricing and if you go to the Immigration office today to extend your DTV you will be turned away. Learn to speak with facts.
nope, guesses range between 1900 baht and 10k for in county extension. Your guess is as good as any other. Point me to an official source for your statement.