You're right, but since you have to lower the prices to sell out all the luxury boxes, the extra profit you generate shrinks with each extra seat. So while it is a good idea to start with the boxes (because they're build fast), you should switch to another category when you have about 30. Then I suggest building the 500 courtside eats (or you start with them as you originally suggested), those are sold out pretty easily. And only then you begin bulding lower tier and bleachers.
So I mostly agree with your plan, except for maxing out the luxury boxes.