IMHO I don't think they're worth anything near the $675 mentioned. Especially not in stock configuration.
The prices of certain guns will only remain ridiculous as long as people are willing to pay ridiculous prices for them. Certain guns, even mediocre ones get this holy grail mystique about them as soon as they're out of production. Maybe they went out of production for a reason?
And who knows, maybe Colt will come out with a new Pocket 9 that's better than the old one. There's definately a market for them.