Before revision:  Agents face quadratic costs-of-carry on their positions and as a consequence, their marginal valuation of the asset decreases when the magnitude of their position increases , as it would be the case for risk-averse agents.
After revision:  Risk-neutral agents face quadratic costs-of-carry on their positions and as a consequence, their marginal valuation of the asset decreases when the magnitude of their position increases , as it would be the case for risk-averse agents.