This paper examines the paradoxical transformation of Nigerian public universities from protected spaces of knowledge creation—metaphorical "ivory towers"—into extractive institutions that systematically deplete human capital and national potential. Drawing on institutional theory and empirical data from government reports, scholarly literature, and media investigations, the study analyses four primary extractive mechanisms: chronic under-funding and financial predation on students, recurrent academic staff strikes resulting in over 1,500 lost academic days since 1999, pervasive "sorting" (bribery) culture that commodifies grades and accelerating brain drain as academics seek opportunities abroad. The analysis reveals that Nigeria allocates approximately 7-8% of its national budget to education, significantly below UNESCO's 15-20% benchmark, while producing 1.7 million graduates annually for an economy unable to absorb them. The paper proposes a multi-dimensional reform pathway comprising funding restructuring, anti-corruption mechanisms, curriculum overhaul aligned with labour market demands, and faculty retention strategies. The findings contribute to the literature on higher education governance in developing economies and offer actionable recommendations for policymakers, university administrators, and development partners. Keywords: Nigerian universities, extractive education, brain drain, academic corruption, higher education funding, ASUU strikes, sustainable development goal 4