Yes that is the incentive which is the mechanism of the flywheel I supose I dont see it as an exploit because if the price of DEC falls below 1: 1005 dec then there will be no incetive to burn. Further more there is no quick swap from dec back to sps potentially without a cost. If you are planning to swap it back , you would need to cover the transaction costs of swaping it back to sps I supose which is not easy @.5%