"The sebenza is a much tougher folder than the ones mentioned. It will handle abuse, abuse I've put them through, that the other knives mentioned will not."
I didn't mention any of the $100 knives by name so how do you know which ones I am talking about? For example, I belive that a Spyderco Manix or Para-Military are probably as tough as a Sebenza. I am not bashing Sebenzas because I have found nothing wrong with them and they do tend to lock up like a safe. I know what you are saying about the 80/20 rule but that is my point. I don't think you get really any more quality that means anything between a Manix and a Sebenza. It may lock up a little more solid but the locks are just as strong. It might have some advantage over the Para or the manix but the same is true of those folders as well.
The measure of a knife is not how tough it is but in how well it does what it is designed to do. If the only thing that mattered was toughness, a cold chisel would win hands down.
What I am saying is, for three times the price, you expect to get a meaningful improvement in something. It is a matter of debate if the Sebenza is any better at all in terms of useful quality. Blade steels are the same (S30V) so you are getting super premium steel either way. The frame lock is good but so is the back lock of the Spyderco.
If you were comparing a Sebenza to an Endura, you would be rigth but some of the higher end Spydercos and Benchmades are very good indeed. When you consider that you can get the best of them for $100-150, I think that is where the smart money is. A $100 Para-Military may not be twice as good as a $50 Endura but it is noticably better and worth the extra price. A $300 Sebenza is not noticably better than a $100 Para and IMHO, is not worth the price. With a Para, you are paying for higher quality materials and workmanship. You get S30V steel instead of VG-10 on the Endura. You get G-10 scales instead of FRN. You get a full flat ground blade instead of the lesser grind you get on the Endura. You get American made instead of Japan made. There is a real difference there. With a Sebenza, you do get titanium handles which is a nice but it is not worth the extra $200 in my book.
Everybody is free to spend their money how they see fit but in some things, you don't get any more for your money. I think with a Sebenza, you are paying mostly for the name. It doesn't cost three times what it does to make a Manix and you don't get three times the knife. If you like Sebenzas, don't let me stop you. I can appreciate that someone would spend the extra money just to have a knife as flawless as a Sebenza but you can't convince me that it is any better than some of the best $100 in terms of pure use. Sebenzas are flawless and they clearly have a few more steps of fit and finish than a Spyderco or Benchmade but they don't do much for utility. For example, I like the way CRKs bevel the back of the spine on the Sebenzas. It shows an extra step in manufacturing but it doesn;t do a thing for utility. There are several examples like this and the only one I can think of that makes a real world improvement if the fact the Sebenzas are always 100% solid in the lock up and they still open and close smoothly. That is nice but just not worth all the extra cash to me.