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Power saving (PS) focused on IEEE 802.16 wireless metropolitan area network (WMAN) has been intensively investigated from both theoretical point and perspective of design and implement. Though the IEEE standard of 802.16e leaves room for flexibly designing, we found that dozens of studies set their focus on mechanism improvement, yet seldom considered when those optimized PS mechanisms might, or should be, applicable in their ways. In other words, for practical reasons, if we have to consider the overhead caused by PS itself, then under what conditions should we launch PS mode smartly and unhesitatingly while under others we had better just remain the communication in normal mode? In this paper, we try to discuss this problem via Rent-to-Buy, a widely adopted model in financial sector, and find the criteria that when to get PS launched for the optimal performance. We accordingly propose dynamic strategies for PS, which show significant performance gains in comparison with static strategies and non strategy case.