I have seen bonds work out nicely on a much smaller scale as a member of an AMVETS Post in northern New York. Our post received a letter from another post in downstate New York. They had purchased property to build their new post but didn't have the funds to complete th project. Through fundraisers and such, they were able get sewer, water and electrical hook ups paid for but still lacked funds to erect a building. They offered bonds that would be paid back with interest and asked for help from fellow AMVETS across New York State. Our post purchased 2 $1000 bonds almost 2 years and the post is finally erecting their building! We expect that once they get their liquor license and start selling pulltab tickets, they'll be able to turn things around. Our local post is one of the smallest in the state and yet we are making a healthy profit. If we can do it so can they.
This same concept can absolutely work for the Bills and there is nothing that says that the money is conditional(Keep the Bills in Buffalo).