Being the first steelbook available locally, the curiosity factor rank high, and especially since it won the top Oscar and it is in a genre that appeal to DVD collectors. If not for the missing Scorsese documentary, I doubt any buyer would have been disappointed given it's price.
As for me, no regrets, and keeping it despite the missing docu. I seldom watch the extras anyway (except when it's a Criterion)...
I doubt there's 10,000 copies of this LE, Da Vinci Code Giftset is only 5,000 and it is still widely available (granted that one is pricier), so is the 999 Troy LE.
Still give it a month or two, and it will become rare as well...same as those Lenticular Batman Returns, Corpse Bride, and even the Superman Returns LE.