In the case I quoted that was not so.
As I showed above, prior to the flight day, I had an email from Immigration saying all that was needed was a valid ticket and passport.
I she was refused I spoke on the phone to the airline (who were happy to let her travel) and the immigration and it was then that they (Immigration) agreed that if I faxed (the letter shown above) then they would allow her to travel. They did the following day, but at considerable expense and inconvenience to both the passenger and her bf who had travelled to the airport in BKK to met her.
As for immigration at the other end. That country in this case here, had issued a visa so of course they were satisfied that she could enter. I don't know about others but I have never been asked if I had enough money for my holiday when I have arrived in any country. The bigger concern is usually that one is not importing MORE money than allowed!