As I wrote in my first post it is more or less up to you if you will pay tax to Thailand or not.
What you gain depend of the tax law in your home country. In Norway the average tax on pensions is 20%+. Average tax of Norwegian pension in Thailand is less than 10%, so there is quit a lot of money to save.
Since filing the forms and pay tax is as easy as paying tax in your home country, it is waist of money to pay so called lawyer to do it for you! Well, I admit there are some that have problem with filling forms and those I know I help and do it for free - what are friends for?
Before 2010 Norwegians that emigrated and did not have a home i Norway did not pay tax at all to Norway. In 2010 a new law said that government pensions and pensions from pension funds would be taxed 15% if you where emigrated for tax purposes. This people would not pay tax to Thailand before after 2010. People who emigrate after 2010 should never apply for tax emigration. Tax to both Norway and Thailand gives you a Norwegian tax below 15% if you are not tax emigrated.
I am reasonable up to date about taxation Norway/Thailand. For other countries involved I have no knowledge. So may be the situation for some will be that paying tax to Thailand is not a smart choice, but for Norwegians it indeed is! And it is simple!