Is Blue Mountain pottery worth money?

The simple answer is, yes, blue mountain pottery is "worth money", since there are collectors out there willing to pay to acquire pieces of it. How much depends on the rarity of any given piece, but most of it will not make you rich, least of all off a single piece. The more common pieces may be worth as little as $5 and the rarest have gone on eBay for several hundred dollars (up to $500 or so). It may go up in value, as the company closed down at the end of 2004, but this depends on the collectors continuing to be interested in it, of course.