I was in a bar on Soi 4 opposite Hooters to meet a lady friend and was sitting at a table facing the street, at the table next to me was a farang gentleman with several girls around him (up to five girls at times including the cleaner), he was obviously a regular and I found out later that he had just returned to Thailand after visiting his home country.
He left the bar with company (1 lady) after I had been there 2 hours.
I asked my lady friend what his bar bill was and was shocked to hear it was over 30k THB!!
Lady drinks at this bar are 190 THB and I was sitting with 3 ladies, my bar bill after 3 hours was 2,600.
Point being, lady drinks can add up quickly if you are entertaining multiple ladies!