when taking guy from the bar most likely to off fee (usually 500) we need to add cost of our drink ( 400-500 ) and boys ( another 400-500). It's why it's helpful to have guy's Line or other contact so we can ask him to visit us without actually going to bar , just give him off fee he will be charged.
But that option , while cheaper, misses whole entertainment part, show , interaction with boys and mamasans in the bar so I personally don't subscribe to it too often.