If money can be made by producing and selling a counterfeit, then someone, somewhere, will do it. It can absolutely reach absurd levels (ask me about fake fountain pens!).
Also, to be perfectly honest the Rat 3 really isn't anything special. The steel can easily be replaced with 8Cr13MoV and the vast, vast majority of users, even very experienced users, wouldn't be able to tell the difference. The rest is just making a solid, low-cost knife of which many Chinese manufacturers have already been proven capable.