New Titan's Stadium

I am opposed to taxpayer money being directed at any private purpose, including the Nashville stadium, but that being said, if you are throwing public money to billionaires, why would you not plan and build a venue large enough to host a Super Bowl? If seventy thousand seats is the minimum threshold to host the biggest game, why propose a facility that only holds sixty thousand spectators? The difference in price of the extra 10,000 seats would certainly be less now than it would be after construction is complete to attempt to add them later.