The Boston Celtics are being sold due to a family disagreement over escalating payroll costs, with the team expected to lose $80 million in luxury tax fines this season. The sale, complicated by a high asking price of $6 billion, is influenced by the team's financial situation and future payroll projections. Interested buyers include Fenway Sports Group and Bain Capital, though the timeline for the sale remains uncertain. These developments could reshape the landscape of both English and American sports.