How about the places to eat or gold shops? Do tuk tuk drivers take you there for free?
You show a woeful misunderstanding of the way the late night BKK scene works. How many times have you been to Thailand...one? two?
The taxi drivers get "tea money" for every customer they bring to the afterhours clubs. Any idiot dipshit knows that you don't pay a taxi driver for taking you to those places after 2 am. They themselves only ask for it if they smell newbie meat.
