You have worked out actual cost well , cars are expensive always look at actual cost and depreciation, the cost will be similar in Thailand , depending very much on which area you decide to reside .
You need reentry for the Kingdom in general 1k for one yes , 4.3k for multiple , no difference where you report , it's an exit visa ..I always buy one on renewal .
and that's exactly why I'd report on the 11 th , then I know I'm due in another 90 days , simple and don't have to worry about any of the other stuff .
That being said reporting is very easy for me , so it's hardly an issue , takes 5 mins .
When I do like this , I just report immediately when I fly back in , go on Jan 11 th ( or 12 th ) and your 90 days starts again from there , far far easier than trying to work out otherwise .
Which makes the entire concept even more ridiculous, why throw 10 k a month down a drain , it's just a systematic , legal , deception , exactly why Warren Buffett likes buying insurance companies ..complete waste of money .
Avoid altogether if you can , if you can't buy the absolute least expensive .
Why would you possibly want to spend 10k a month on absolutely nothing ? Because quite frankly that's what you'd be purchasing , he appreciates pre existing will not be included , it's all a giant web of deception , if he/ she " has " to have something , consider it a tax and why the cheapest .
This " friend " would be completely wasting their money either way , best to avoid altogether .