Think you missed my point.
There are other considerations than just the annual 12 month extensions.
The OP lives in Bangkok and if uses an agent in Pattaya the stamps will be from another province.
This can cause some issues with things such as stamp transfers to new pp, certificate of residence for things such as TDL, 90 day reports etc etc.
Perhaps you live in Pattaya.
Where are your stamps issued. If Pattaya then you don't have these issues..