You and others with the no limit thinking are not up to date on the current situation. What your saying was fine say back in 2005, but unfortunately spending large amounts in thailand now as a tourist is scrutinized heavily. An immigration officer told me they basically think like this , a genuine tourist comes to thailand once, maybe 2 or 3 times a year going back and forth between their home country. If your not doing something like that they would investigate further. I don't necessarily agree here as some tourists perpetually travel around but they dont see it like that so we must work with what we got.