The Players and the Bills are also effectively funding the Stadium
The Bills Salary cap is $200 M and let us assume they are paying $250M in actual cash (Signing bonus, roster bonus which are all amortized). Most of the players will end up paying roughy 8-10% in State Income tax. ($25M)
The Sales Tax (for expenses by the Bills players and families), Property Tax on the homes purchased by them could result in another 1M or so in revenue.
Additionally, the players could be spending on an average of 50K per year (per player/family) and generating cash in the community of around 2.5M and improving the viability of local business (Car dealers, Household appliances, Food, Retail, Entertainment etc).
Let's assume the total impact of the BIlls players is $30M and add in a $4-5M impact with the rest of the Bills organization (Coaching staff, Trainers, Employees, Pegulas income).
At a median (with moderate growth) of $40M per year impact, the state should be able to recover (with a low interest loan) $1B in about 25 years which is the current state on Stadiums before they start requiring renovations,
This does not even consider the economic impact and growth generated due to the presence of the Bills in the Buffalo-Niagara area.