Luzary boxes cost a lot to build, but The revenue from every game is also high. I sell 4-5 luxuary boxes, but I have 13. I build too many, but now I will not have to worry about saving to build those in the near future. I would get lots (few thousad) of bleachers, and 200 lower teir (when you can afford it) you will have your revenue go up A LOT.
dot build more than 3 luxury boxes though.