Just a quick apples to apples comparison between the two used Cold Steel SureBalance throwing knives...
1.1.13 - .80 inches of material shattered off the end of my knife when it impacted a hard surface. That's almost a full inch of metal gone depending on if you measure from the front or the back of the fracture.
2. When the two pictures are sized to match the angle and length properly, you can see that my knife has much more and deeper penetration wear suggesting that it has been either thrown harder, more often or has been used in a softer target media allowing for deeper penetration. Your target is an end-cut log, and so is mine, so I'm going to go with the thrown harder thought, assuming that we've both thrown a bunch o times, as you indicate. Though you do say your wood was frozen, so perhaps that's why it didn't penetrate as deeply..
Just thought overlaying the two images and then illustrating the actual material loss and overall impact on the knife when it does fail, would shed some light on usage of these knives.
Throw them softly into nice soft targets, and all will be well. Mess up and miss, or hit something hard, and its game over.
Still, for the price these cost ($20 each I've seen them some places) I guess its the "quantity" equation that factors in here. Buy a bunch of cheap knives, and who cares if they break.
I guess I look at it like this, you buy cheap, you own cheap, and you throw cheap. The best the knife will ever be is a cheap knife from China.
(I really do sound anti- Cold Steel... ) Which I'm actually not... just saying, this knife really disappointed me.
- Hal Zucati