This is interesting information Waye. 15,000 seats is actually the minimum number of seats required in the NHL although most cities have more (although in places like Florida and Atlanta it doesn't do much good because many of the seats are sold for $15 - $20 a piece or given away).
I think that a CFL team in Halifax would also be a success story. Like the Winnipeg NHL story shows, as does the Montreal Molson Stadium, teams can succeed with fewer tickets. Having an oversupply of tickets is not good either since it drives down ticket prices.
There is a big difference in revenue requirements for a NHL team and a CFL team. The current salary cap in the NHL is around $60 million dollars and reportedly will be around $62 million next season -
http://en.wikipedia.org/wiki/NHL_salary_cap . The CFL 2010 salary cap was $4.2 million -
http://www.sportsnet.ca/football/cfl...-salary-cap-0/ .
For a NHL team to make money, it needs to be in the $80 - $90 million dollar revenue range per year. The CFL with its much lower salary cap and much lower travel expenses might be able to break even or make money at $10 million revenue per year. If a CFL team sells 25,000 seats at an average of $400/year per season ticket (for 9 games plus an exhibition game) then that would be $10 million dollars. More realistically, they might sell tickets for less than this but also get advertising revenue and some TV revenue.
I hope that Halifax will build at least a permanent 25,000 seat stadium that can be easily expanded. I would prefer to see Halifax start with just the basic amenities and then add to the stadium as required. I think that US university stadiums are a very good model for the CFL (but have a partial roof). Most appear to be appealing, but economic designs. Winnipeg is an established team, they can afford a more expensive stadium since it is being mostly paid for by the Manitoba government.
My concern is that if everybody thinks that $90 million is required to build a stadium, then Halifax will get a $90 million dollar stadium that could have been built for $60 million - $70 million dollars (much of the difference will end up in the builders bank account). It would be better to go to a number of builders and say this is the money available, what type of stadium can you build for that amount?