We can't really say it is really a scam as we take the reponsibility to risk it while knowing exactly the risks. The second test on day 5 is still a ridiculous policy because as you said, it means you can get the covid in Thailand and pay a huge price for that. It is advisable to postpone any 2 weeks vacations in Thailand and choose another country at the moment. Philippines are opening on the 10th of February and they don't have those absurd policies.

Pretty sure you need a PCR test if you are not vaccinated 48 ou 72 hours before. It has been the common rule since the beginning of COVID for travelers who fly.

I was wondering about re-entries. You have to go to the inmigration everytime apparently? And any problem to come back sometimes?

This is the kind of answer i am prepared to say everytime at any border. The rule is don't look like a tourist but always act as a tourist.

I had those 20k last time at the airport but damn this is so inconvenient to carry so much cash when travelling. Any report about travel cheques? I heard they should work as proof. At least if you lose it or get stolen you don't lose the 20k.