From what I understand the extension is 10k baht but you can do 180 x 10 border bounce instead of 180 + 180 days extension + bounce repeat 4 more times. Less costly to bounce every 180 days.
The cost is NOT 10k every 180 days. Frank is factually correct about everything. It's in writing, if you can't read properly and understand what multi entry means, not his fault.
Those are significantly better because you can extend forever without leaving the country. This one is 6 months only with 10k baht to extend another 6 months. And the reason why the LTR failed completely is because of too much financial requirement.