Quote - lesbentley: Slight correction there: the polygons share vertices, so in a typical quad mesh one has about the same number of polygons as vertices. In a fully triangulated mesh, one would have appraximately twice as many polygons as vertices.

Doh! I made the stupid assumption that as there are 4 vertices per quad, I needed to divide by 4. Totally overlooking the fact that each vertex is part of 4 quads.