I can see why! Licca and Blythe bodies are easily interchangeable, which definitely helps when it comes to dolly accessories and whatnot. ^^
In fact, the first six or so Blythes manufactured by Takara in 2001 and 2002 were made with Licca bodies. (One example of those is the Blythe in my avatar.) After those six, Takara started using the Excellent body-- a more Barbiesque body-- instead.