there is a fine line with mesh and polygon count, this car body for example , the bodywork only is 647k faces, 1283220 edges,  almost 100mb in size, dont think anyone wants to use this in Poser if that is what you are aiming for. but if you look at the mesh for instance on the side skirts you can see where the creator has managed to save polys where they were not needed. Closer examination reveals lots of savings. BTW this is a mesh created in autocad..........