Buy 10 ok but cheap knives, put two in your tackle box six in the boat and two in the kitchen.
When they get dull from cut bait etc. chuck em out.
If you loose them or forget to clean them and thay rust, no big loss.
I have tried them all and the cheap ones can be sharpened faster and work fine.
I have lost more knives then I have used up or worn out.
Now when I say cheap I dont mean $2 knives, Repalla is a good cheap one
WalMart Repalla's around 6 to 8 bucks
10X8= 80 or a great knife for 75 bucks, your choice.
Just my 2 cents