Busch Stadium drew about 43,000 a game for a decade and 27,800 in 2025. Chicago and Toronto still fill their parks, and it feels like the empty seats belong to mid-size Midwestern cities (Pittsburgh, Cincinnati, Cleveland) rather than to one bad team. This notebook checks that feeling against every regular-season game since 1990, one hypothesis at a time, and keeps a written log of every cleaning step so the analysis can be audited and repeated.