There are price curves on http://bb-usa.net/blog/?page_id=9 (login required) which shows data for a lot of arenas and can be used to accurately asses average attendance numbers for a given section at a given price at a given level. Using these to calculate which areas are most profitable to expand for the average team would cause someone to spend more than twice as much on bleachers as LT for d3/d4 USA (never checked other divisions but these are the most important consideration for the majority of players). The point you make about bleachers sucking when you lose is factored in to these numbers as all teams have equal weight.