The arena has a soft cap of around 20k attendance, so even if you build a 30k arena, only 20k fans will come depending on factors like level of league and your current league record (winning games always help). With that being said, if you are a new team starting out from the bottom, I suggest you start building luxury boxes and court-side seats until you max it out as it is mostly affected by pricing rather than league record, then gradually build up the remaining boxes until you get to around 20k seats.
Wow thank you very much that was extremely helpful. A couple of questions.
1. What did you mean by building luxury boxes and court-side seats until I
max it out? Is there a hard cap on the different seatings?
2. So you recommend completely ignoring expansion of bleachers and lower tier until LB and CS are maxed out?
Thanks!!