Very sad to hear of this when their PM is working so hard to woo visitors to their kingdom, to the extent of personally appearing on an advertising campaign being splashed over the internet.
It's not the first time I've heard of scams at BKK. Another favourite one is a businessman arrives on an international flight and proceeds to declare his dutiable goods for bonding. The first customs officer says it's OK and waves him through - but before the businessman exits the customs hall, another officer pounces on and detains him for not paying import taxes, and on top of that they impose a hefty fine with threats of imprisonment, until even more money is paid over to keep the officers happy.
Thailand is a great place to visit but it is unfortunate that a few individuals spoil it so badly.