I think it's a good idea to use animated gifs when people are giving away animated pose files. It's more annoying to see all those same hair textures over and over again, but even then I can just ignore them if I've already seen them a few times, so it's no big deal. Another annoyance is when somebody posts 12 separate thumbnails in a row for similar tunic or dress textures by the same author, when 1 thumbnail would waste less space.