A folder can be worth $400 and even more if it's made of the right materials and is beautiful. I've seen gorgeous folders that would be a great addition to any safe. Alas, the Sebenzas don't fall into that category. The frame is titanium, the blade is a flat gray, the frame lock fairly standard. I don't think they last any longer, cut any better or are more beautiful than many knives costing far less.
I've seen people posting photographs of knives costing about the same as Sebenzas, but made of far nicer materials and more beautiful blades polished to mirror finishes. Some make intricate Damascus blades, and the fit and finish is every bit as good as Chris Reeves' knives.
Those who buy Sebenzas don't get better cutting power, neither do their knives last longer. All they get are better tolerances, which gives them nothing. If people must, chase the steel. But the tiny Sebenzas might be like Rolexes. A Rolex isn't going to keep better time than more inexpensive watches, but Rolexes look better, and Sebenzas don't really, at least in the opinions of many. If I found a scratched up Sebenza on the street and didn't know what it was, I would have no idea I had a premium quality knife. I might know it was a good knife, but not one costing several hundred dollars. If I found a Rolex, I'd know immediately it was a good watch.
If I had $400-$500 for a folding knife, it would be jaw-droppingly gorgeous. A Rolex will last longer than other watches and will be built exactingly. A revolver or auto will shoot better or faster, or more reliably than other, cheaper guns. Expensive cameras will offer better optics and features; and so it goes for other products. The bottom line on a Sebenza is that it doesn't offer a longer life or better cutting. It's not more beautiful and, in fact, is a bit bland compared to other knives. Just doing some random shopping for knives in the price category, I found the Sebenzas to be at the bottom of the barrel for looks. I've seen others that had mirror bright blades and really beautiful scales. That said, I find them to be nothing more than status symbols in the knife world.