Even if it is for marketing purposes, I'm happy to play along.

Any studio lurking here is welcome to know what I think of their policies and what I want to buy.
I'm a bit of an uber-collector, though I think Ben is the all-time champ around here. I think I'm on a similar plane as droosan, probably.
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Do you consider yourself a collector, and if so, how many Disney DVDs/Blu-rays do you own?
Dozens. I have all the animated films, and all of the shorts that are avaialble. I also have a bunch of live action Disneys, especially anything that came in a two-disc set. So far, animated Disney Blu-rays have been an automatic buy for me.
Incidentally, I have owned most Disney animated films on laserdisc, too (thereby showing that I'm older than a lot of the other forum members). About the only LDs I never picked up were Make Mine Music and Melody Time, which were only released in Asia, and pricey if you can find them. I do have the Japanese LD of
Song of the South.
On all formats, I have well over 1000 titles in total, across all studios.
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When you want to buy a Disney film on disc, and find that it's not available, do you buy it from the secondary market or wait for it come out of the vault again?
Being of relatively mature age (same as GeorgeC or Droosan), I've been able to stay on top of things pretty well in terms of DVD and Blu-ray animated releases, only bypassing a few 'B' level titles that I was satisfied enough having on laserdisc. Even then, sometimes I discovered that my laserdisc had rotted, forcing me to pick up the 2nd DVD release of Great Mouse Detective, for example. I still have only the LD versions of
Robin Hood,
Rescuers Down Under and
Sword in the Stone, though I would have bought the DVDs if bonus features were better. I'll likely upgrade to Blu-ray when available.
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Do you buy more discs on the primary or secondary market?
Mostly primary, since I normally buy what I really want upon release. Occassionally, I use eBay or Amazon Marketplace sellers, but mostly for non-Disney stuff. I do sell a lot on eBay. (More on this later.)
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Do you follow Disney's release schedule, so you will know when specific films will come out on home video?
I keep track of that pretty closely. Always have.
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Do special features affect your choice when picking out a DVD/Blu-Ray? Will you go out of your way to acquire a copy of a specific release because it has more/better special features than another release of the same movie?
With some films, it doesn't affect my decision to buy, only my level of enthusiasm. For other films, special features can sway me if I'm otherwise on the fence about a purchase (e.g. Vault Disney titles like Swiss Family Robinson).
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Have you ever "double dipped" on the same movie, and if so, why? (to take advantage of better special features, a new transfer, a higher resolution, etc)
I have bought some movies on VHS, LD, DVD, and finally Blu-ray (and a few obviously non-Disneys on HD DVD). I often double-dip on DVD, but only if there is an improvment in video presentation (Black Cauldron) or bonus features. Marginal "upgrades" like Mary Poppins' last DVD release don't do anything for me. Upgrades to Blu-ray are mostly a no-brainer.
Due to space and financial considerations, I usually try to sell any previous versions, so I don't have multiple copies at a time. At this point, it's not usually worthwhile to try to sell LDs, but I do sell DVDs on eBay. I won't sell the DVD if the bonus mateiral has not been duplicated on Blu-ray (e.g. Fantasia).
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Do you think Disney charges too much for their discs? If so, do you find ways around the high list prices?
Their pricing is a little high, but with their $10 off coupons and Amazon deals, their pricing becomes more competitive. I definitely am a deal hunter.
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How do you view Disney's vault policies in general?
I'm so used to them, and have been through enough home video cycles already, that it doesn't affect me. Their "vault" isn't really so different than any other film going out of print after a while. Disney just trumpets it more, to encourage rapid sales; retailers compromise by ordering more up front. Dinsey's "vault" window may be more narrow than other DVDs, but if you're already in the market, it's certainly not hard to keep up with releases. I've always assumed that the "vault" matters more to younger colelctors anxious to start their collections once they have the income (particularly once the kids start coming).