Shouldn't Knifes Be Cheap?
Cheap is in the eye of the beholder. If you're making $8.00 / hour digging ditches a $100 knife represents a lot of labor, if you're making $50 / hour sitting behind a keyboard it's not so much.
A knife CAN'T last so why spend large amounts of money on what is really a disposable tool?
That 1,800 year old Roman multi tool would dispute the claim that they CAN'T last. I have a couple of my grandfathers pocket knives that work great, the blades are worn but have a lot of steel left (even after decades of sharpening) and are very sharp. How long do you expect it to last? One lifetime is probably enough, even though most decent knives - even inexpensive ones - will last longer.
It still costs over $100 to fill the gas tank in my truck, that gas will last about 7 hours, if I'm not towing anything, a $100 knife that might last centuries seems pretty cheap.