"Expensive" is a relative term, for some $20 is expensive, for others $1000 is disposable income..
My most expensive folder is a classic Sebenza, I carry and use it regularly.
For me I like to carry and use my knives,thats how I enjoy them!
When I see Damasteel, Timascus, mokume, mammoth ivory, intricate engraving and machining, precision tolerances...
I can see and appreciate the value in materials, the skill and hours put in by the maker, in design and execution.
I know because I have made a few knives myself...
If you plan on using a knife hard or regularly, there is no such thing as perfect or indestructable, it MUST be , within your budget replacable!
Properly used and cared for most well made knives will last a lifetime or three.
But every cut you make, wears away steel...eventually...