I'd be hard pressed to pay more than $150.00 for a knife that I planned on using in the field, can say that most of the knives I use consistently didn't cost me much more than $75.00, and would go as far as saying that the rest of the knives I actually use cost between $10.00 and $30.00.

The Bear Grylls knife is probably more of a blade for collectors or fans of the show and will in most cases be displayed rather than used if I had my guess.

If he can sell a knife for that much just by name recognition, more power to him.