Personally, I don't favour these types of designs for my own use either, but hell, they sell. And I mean SELL.
Remembering that many buyers are collectors, not users. These knives appeal to a particular group. Just like there's a group that buys fantasy stuff - the Jose DeBraga and Gil Hibben material. There is no doubt, - getting some of those facetted lines and keeping them clean is difficult. And that counts for added appeal.
I suspect that even if the buyer has purchased it for looks rather than use, in a pinch they will find a way to use it effectively - such is the power of visual appeal.
Don't know if this makes sense. Jason.