Basically,
Because the Marlins owner is a crooked little worm, exchanging briefcases with politicians claiming he was broke and made no money off the Marlins.
Promising how building a billion dollar stadium in a slum neighboor hood would increase profits all around the city and rejuvenate Downtown. Then, once his finiancial records got hacked and it was shown what a foony he was. Welcome to Miami politics.
Kinda funny, that his buddys construction company got the winning bid....oh, they were also the only company to bid....a cool 15% over market value, so someone got some chump change in their pocket.
Oh, did I mention the % tax increase to all of us tax payers to cover all the cost?