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If a knife is a popular one with the "buying public" it more than likely won't be discontinued. I know that the folding Kalinga became very popular here on the forum after it was discontined, but I'd bet if it was a popular "seller" before that it wouldn't have been.
It could have been an issue of production costs versus reasonable selling price.
It could have been an issue of production costs versus reasonable selling price. In which case even steady but not spectacular sales could result in discontinuation. But that's speculation in this case, as I'm not an insider.