It's probably a mistake to get involved, but here I go.
It may not cost them the sale of a knife to someone who isn't going to spend $500 on a knife, but consider this: Joe Blow, a non-knife-knut, buys a SanRenMu 710, or whatever it is, for $15, then sees a picture of a Sebenza online. "Cool!" he thinks. "I got a heck of a deal on this expensive knife. I didn't know it was called a Sebenza. And, it is made of something called 'super-steel'! I can do anything with this!" He goes out and breaks his "Sebenza", maybe injuring himself in the process. Immediately, he contacts CRK, and complains about it. They do their best to help poor Joe, and ask him to ship the "Sebenza" to them so they can determine the issue, possibly even paying for shipping. Of course, they immediately determine that the knife is not a Sebenza, and they inform Joe of this. Joe, not being a knife-knut, and not knowing the reputation of CRK, doesn't believe them. They must be lying to protect their company. He finds Bladeforums, and rants about the poor CRK quality and CS. Most of us don't believe him, but maybe some do. Then, he tells all his friends the same sob story. Maybe he even posts a Yelp review, and people looking for a sharpening service for their VG-10 knife that won't get shaving sharp read it. Now, not only has CRK spent time and money trying to help someone who never bought from them, but they are losing potential sales, as well as their reputation. Now, Joe was never going to spend $500 on any knife, but maybe now you can see that he hurt the company by buying a clone. If you multiply this by the hundreds of times this happens, or maybe even thousands, you can see how Spyderco nearly went out of business. Clones, counterfeits, and copies, all hurt legitimate designers and producers.