I worked on a VRML retail store that had 3D products on 3D shelves and 3D customer service reps you could chat with. It was just like shopping in a real world retail store, except you're tripping on LSD flying uncontrollably upside down through a bright colored world of blocks and pyramids while wearing binoculars until you punch a hole in the sky and your browser crashes. The world just wasn't ready to shop in 3D.