I just came back from Cambodia after I did my tourist visa from there and before that I make it from Penang Malaysia.. when I reach the passport control they stop me and send me to another disk and the officer there started to ask me why you come here like this is your third visit what you are doing here!!! is that is a normal situation because this is my third time

Is the 20k THB requirement used as a legitimate reason to prevent foreigners entering, or it just a pretext for refusal based on too many back-to-back tourist visas/exemptions?

In other words, has any legitimate tourist ever been turned away for not having the cash?