Place yourself in this scenario: you don't get to play a version of the game (demo, beta, etc.) before it's released and therefore get a chance to judge the game for yourself. Say you've seen some gameplay, and it looks good, but you're still not quite sure. Based solely on your opinion on Bungie as a developer and their past successes and mistakes, would you be willing to spend the extra cash on a limited edition? I realize there might be some bias, since this is Bungie's website.
I personally would, as to me, Bungie has proven themselves to be a developer that is extremely passionate about the games they make.
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I got $150 GameStop for my Christmas from my cousins/aunt/uncle. The $100 gift card is going towards my preorder for the Limited Edition of Destiny. The other $50 will cover the rest of the LE, and what's left will be for a game guide or whatever else.