All dive gear is overprice. If you can get a good, new but older stock name brand BCD for around $200 then you're doing just fine. Obviously you can't test it before you buy it unless by chance the Ebay seller happens to live within a reasonable driving distance but the listing clearly states that it's returnable if not as described so there's no risk here.
Alec Peirce has a series on Youtube one of the videos is how to service the inflator dump valve, you oughta take a look at that one. Also that particular BCD can be vented by pulling on the inflator valve rather than holding the hose over your head which is a handy feature.
New but older stock that is a few years old of a name brand BCD for $200 is good. At 14 years old we are way past a few years old. There is no vintage value in the BCD the OP linked to, and to pay tha much for a BC that old is just rediculous.
Lets hypothesize the original price for this model BCD, 14 years ago, was $600....if one depreciates the value by 10% for the first 4 years, 15% by the next 4 yeas, and then 20% for each additional year beyond year 8, the depreciated value of this BCD would be just under $54.
Just because it has never seen water or left a shop does not mean it is "new"....it is just ridiculously "old stock" that some shop failed to sell.
-Z