This has gone a little far, I think. OP you make way too many invalid comparisons here. First of all, Italian cars are require more maintenance than american muscle cars because they are many many times more sophisticated. You cannot compare reliability across such vastly different products like that, similarly I can say my wheelchair will last way longer than your american muscle car. Besides, they don't even have the same level of peak performance. The Italian does require a huge maintenance schedule to perform at the highest level it can, but its peak performance is so high that even if maintenance is neglected and it does not perform at that level, it will still drive better than the American. And don't bring in racing corvettes and vipers, they're just as complex and difficult to maintain as their Italian counterparts.
Next, a Sebenza cannot be compared to a Ferrari, or any top end sports car at all. Ferraris, Zondas, Koenigseggs are renowned for their PERFORMANCE, whereas Chris Reeve's knives are renowned for their quality. What are you looking for in your knife? Edge retention? Lock strength? Quality of fit and finish? If you have to use the car analogy the Sebenza is far more like a Bentley or Aston Martin, highest quality with utmost attention to detail, whereas the Buck 110 would be comparable to something like a VW Passat, reasonable quality and reasonable performance, but cheap. Of course most of us would buy the Passat, because it makes the most economical sense. But some of us can afford an Aston and really do want that extra quality, which is why such cars still have a market. But knives are not that expensive, $400 may be a lot for a knife but in the grand scheme of things it's a sum of money most of us are able to fork out. For many of us who want and demand utmost quality out of the things we own, the Sebenza is one such way to satisfy that desire.
Sebenza owners who mention they clean their knives often aren't doing so because they have to, but because they CAN. Chris Reeve manufacturers his knives to such a high degree of tolerance he doesn't think you'll be able to mess up the dissassembly and reassembly, because they fit so well together. That is why his knives are the ONLY ones on the market that will not have their warranties voided if you open it up. Sebenza owners are also mostly admirers of such quality, and enjoy the cleaning process enough to want to do it once in a while, even if the knife doesn't need it. If you tried to do that with any other knife, your warranty goes poof.
Once again these two knives are too different to be compared. They're targeted at different people, and serve different purposes. I agree fully that the Sebenza is far beyond the point of diminishing returns both in terms of quality and performance, but such diminishing returns have to be accepted in order for quality of such a level to be attained in the first place. The fact that it sells so well, is simply evidence that there are many people around here who are able to accept those diminishing returns for the quality. These are people who would buy Aston Martins, Mont Blancs, and have custom leatherworkers make their bags for them. They do it not because it's the most cost effective method, they do it simply because they can, because they want to. If you had the money to go to a nice restaurant once in a while, wouldn't you go rather than eat instant noodles and spam all the time? The examples I've mentioned above are just scaled up versions of this same attitude. The Buck on the other hand is all about cost effectiveness. If you're strapped on cash, then go right ahead, of course the Buck is a better choice. Indeed many people aren't willing to fork out the money for a Sebenza, which is why Buck sells more 110s than Sebenzas.
OP you didn't create this topic with a question did you, you created it with an opinion already formed. You're taking in all the information that's given to you in a biased manner. Until you make this question truly objective, you will never figure out why some people prefer Bucks and some people prefer Sebenzas.