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Reinvesting earns you more money DRIPs are useful for many reasons . Every $ 2 you spend using the debit MasterCard earns you one Continental OnePass Mile ( half of what you 'd earn with a credit card ) . Each win earns you credits , which are used to purchase new cars and parts . Kills earn you red orbs that charge up a super-attack meter . If you make estimated income-tax payments , mailing the fourth-quarter installment by December 31 earns you the deduction in the current year - even if part of the payment is returned to you via a state tax refund the following spring .