shane45-1911,
My comment was sincere, I can assure you. I asked the question only because I know that Ernie has made some 'odd' looking pieces at the request of the military for specific uses.
Further, Microtech made a knife called a 'Vector,' with the same type of concave belly. I would assume (and never assume) that a manufacturer would not tool up for a knife if he thought the item had no market. The knife, while different from the norm, was designed to cut something, or attract buyers.
I just don't know what the reason was, and I like Striders. But hey, I kick tires at the Ford dealership, as well.