the data on the charts at the usa website stop around 22 to 23k total attendance for div 2 and div 1. that is why 52k seats for div 2 and 104k seats for div 1 is an extrapolation. the charts are not labeled regarding whether the attendance is just for usa teams or for all teams
without these "soft caps" of around 20k attendance built out arenas in div 2/1 would be generating at least 50% more profit (by pushing "correct"/optimal seat prices down to 18 min in lower and 5 min in bleachers)