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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There would have to be a noticeable difference between [i]hardware[/i] exclusives rather than [i]software[/i] exclusives for me. I feel that too often in today's gaming world for consoles that using "in game exclusives" (armor, weapon skins, bonus content, DLC codes etc) are trying to be forced to justify the cost of a Limited Edition. I'd like more hardware that I can save on a shelf for years to come, the Halo Reach Statue was a great example.