To add some numbers that I've come up with as a Newbie.
I've added 15K seating, and converted none of my 5K standing, to date, so total capacity is at 20K. Costs go up per 500 seats above 20K, but I've calculated the following:
Home revenue per standing seat: $2.48 / game
Home revenue per seated fan : $4.95 / game
Payback period for a new seat addition (assuming seat is sold each game): 18 home games
Payback period for new standing addition: 11 weeks
Payback period for conversion of standing to seated: 24 weeks +
I haven't been able to find anybody who knows if some (successful teams) charge more per seat per game than others. Obviously, successful teams draw more, but are their ticket prices higher?