What is a knife worth?

[Davor]

I agree completely.

To the OP, there are so, so many factors that go into determining how much a knife would be worth, and unfortunately it's a fickle thing, sometimes hard to reliably gauge. However, you can spot trends based on things like resale value, correlations between material choice, designer and manufacturer, whether the knife was part of a limited run, etc. Some knives have quite a following, such as many Spyderco sprint run knives or Benchmade limited runs or gold class variants, and so fans of those knives are willing to pay an arm and a leg on the secondary market. Discontinued knives can see a much higher return if bought before the line was cancelled, and this will change drastically in scale once you enter the world of mid-tech and custom knives.

I have a few that were discontinued or the original knife maker has passed. At that point, it's even harder to sell. I have read BF members who have regretted selling their grail Or special knife. You also have those with too many or really need the cash. And there are those that buy a batch of a limited brand so they mark it up and resale it.
I edited my original but I was not asking the price of the two I listed. They were just the two I would first sell that I know would be purchased quickly.