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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No. I have never bought a legendary / veteran anything, and unless there is something actually of irreplaceable value in there I never will. The only thing I missed out on and would have liked to have had was Halo 3's Chief's helmet. Other than that, no. You are talking about a game that we know basically nothing about. Why in the world would you shell out extra $$ for something you don't even know if you are going to like or not?