Considering the number of them he has listed and that as I remember none have sold. I think gives you your answer.
Part of the problem is it is 16lbs. Even though they were made special for a certain purpose, for many bowlers that doesn't really matter in todays game and drill techniques.
Even at 15lbs I don't think it would sell near that high. If you throw 16lbs, you can find almost any ball from years ago available at some time or another on ebay, new, and usually for less then $80. It isn't as popular of a weight and the sales reflect that.
Be good, or be good at it.