The few times I've clicked an image without a thumb, it became obvious why they didn't include a thumb - the pic sucked. I no longer bother to view thumbless pics as there are many excellent images with thumbnails, and only so many hours in a day. On a related note: ever notice that "cropped" thumbnails are generally better "composed" than the full shot? There's something about the decision of where to crop the thumbnail that forces a person to focus on whats the real point of their pic. Many gallery images are disappointing compared to the well-focused thumbnail.