Angry Trade-in your old phone for $100 when buying the HTC One

Thinking about picking up an HTC One, but worried about how you will afford it? HTC is going to help you with a $100 credit for your old phone.
I think it is good for those thinking of getting a new phone.

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I don't think this is against the rules, but if it is, I will be happy to have it deleted .

(I'd be happy if someone could clarify this for me: "Pre-register with your email to qualify for FREE Prepaid Visa Card worth either $100 or the trade-in value of your old phone – whichever’s greater". Does it mean if my phone's value is greater than $100 I'll be getting its value? It seems too good to be true)
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OnePlus One: Carbon 4.4 with Franco kernel.