Gorilla poses being a slightly more popular download? Several reasons I can think of, but the simplest is - Gorilla Poses work in Poser artist, P4, P5 & up, while your incredible shaders only work for people who have P6 or 7?
Plus, a lot of P6 & 7 users shy away from the more complicated aspects - they're uncomfortable with magnets and lighting, let alone materials and shaders, that's why most clothing, sets, and characters sell better with MAT poses or material settings than just with textures.