I have a couple of thoughts on this. My first thought is they are not taking the time to use the clip preview creator or uploading their own created previews when uploading their clips because if you don't do this C4S automatically uses the first few seconds of the clip as the preview. If the start of the clip has no tickling then no tickling will show in the preview. My second thought is maybe they don't want to give too much away because some people do what I call preview surfing. They will wank to just previews and some of the more tech savvy will even download them to put altogether into one clip. I always find it funny when people will comment about how great certain clips are on my store either here via threads I post in the video section or other social media and said clip hasn't sold a single copy.