As the Trade Fair King, let me share some secrets with you to make your life easier in Forest Hills.
In the above diagram, you'll see Trade Fair's layout. The ovals are customers, the boxes are the registers. Register #5 opens only when the lines start to build - but it faces register #2. So if there's a wait, always get on the line for register #2 - but drift over to block any bastards who try to cut around you when the open register 5. When #5 opens (you'll know it when someone comes out of the office), it's yours. You're welcome.
Please feel free to share any tricks you've learned to improve life in Forest Hills.