"But, modeling is a lot easier if you can use fifty-elevenbajility polys...."

you're definitely right in that point (just watching a few "speed" modeling videos shows you how different a process it actually is), also calling ZBrush or Sculptris modeling in virtual clay is somewhat deceptive as anyone that has ever done extensive modeling with clay will tell you. With clay you have to worry about gravity, structural support, drying, cracking, and numerous other technical considerations. Anyway, I'm hesitant to call the process of modeling in a 3D app legitimate sculpture in the common usage of the term, as the whole evolution of sculpture has been based around support in the face of gravity and material considerations... Painting in Photoshop is closer to it's ancestral roots than 3D modeling "sculpture" is I'd say. Anyway, yeah... Definitely some talented artists on display over at ZBrush Central, I mean regardless of the amount of polys these guys are demonstrating some serious chops with anatomy, design, and overall imagination. Doesn't matter how many polys you have if you don't know how to use them;).