it's possible that the decision to ban nude thumbnails is related to a desire to shift nudie pix to other sites. if nudie pix don't show any tendency to draw in users who buy poser items (e.g. clothing), then shifting the burden of nudie pix to other sites may increase their revenue per user here. it's not cheap hosting hundreds of thousands of nudie pix, whether in terms of server maintenance, software maintenance, or bandwidth costs. hence the tendency to archive most of the images, as new ones are dumped into the gallery at a rate of 1 per minute or greater.