I guess i might as well chime in
Here's my take on this issue. If you want a knife... just a knife... to do what knives do, cut stuff, there's no reason at all to get a sebenza, a hinderer or any of the top shelf customs.
For much less money, you can purchase an extremely good quality, well made tool that will do the job just as well as any of the above, using very good steel and excellent design. Examples include Zero Tolerance, Spiderco, Benchmade, kershaw etc...
On the other hand, if you look at it like I do, my knife is more than just a tool. Yes i use them, daily, and sometimes hard, but they are (and i admit this is just in my head) to me at least, an extension of myself. My knives are an expression, in steel, of a type of artistry that is sadly lacking in many parts of our day to day life.
A sebenza, or any major custom represents something that is dying out in our culture. The ART of making a perfect tool for the job.
It used to be the case that tools of all sort were made by artisans to exacting standards and could be used with pride. Now we are living in a world where tools are made by 10 year olds in factories by the thousands and the making is completely detached from the using.
A custom knife reconnects you with the maker...
and that's my rambling attempt to tell you why a custom is worth the money