I'm a fan of variants, much more than most. If I was that big a SMS whore i'd have to think about it, especially if I'd gotten the other few UPC variants. Is 900 bucks pure insanity? You bet. Have I almost spend 400 bucks on the Syphon Filter 3 variant? Yup. If someone wants to make sure that their collection is as complete as they can make it, who should give a shit? Buyer was happy (assuming he pays) and we know that the seller is more than happy.
None of you are going to be doing this, so what does it matter?