Why would Apple offer rebates to customers who already gave them money and bought the iPhone at the $600 price

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Why would Apple offer rebates to customers who already gave them money and bought the iphone at the 0 price?
I could guess it has to do with brand loyalty and the rebates being an attempt to show sympathy and trustworthiness, therefore simultaneously winning the hearts of on-the-fence consumers and also wining back apple fans who [...]