@Rex -
The flash preview is way too small, grainy, and short to get a sense of how the model moves. What I like about the new demos that used to come through the carousel was that we got to see a little about how she moved with the pole, on the task bar, etc. That is a real selling point.
Plus, the way a model moves is very important to me. If looks were the main selling point, I would just find their pictures elsewhere on the internet. VG is a very unique product in that way.
There were girls who, also, on first view I was not interested in. Then after a while, they came around on my carousel again and I was able to later see something interesting. I then purchased a few of those. I can't say exactly *why* a model moved me later and not the first or second time around, but that could not have happened without the demos.
If it was just the flash preview, I wouldn't have gone back to that model's cards at all. I'm seconding a lot of what ChaoticEvil said, but there's my input.