The main reason for that is because I overthink. Most of the time I don't even know what to say. I don't want to just say that you're story is great..I want to give helpful criticism, but then I feel like I don't qualify to do that because I feel like my stories aren't really that great lol. I also don't want to leave a really long comment or too short of one. So in the end I just stay quiet. If I subscribe to your story then in a way that is my way of letting you know, even if your story is subscribers only, I wouldn't have subscribed if the plot didn't interest me. So please keep on writing your stories even if no one comments, they are probably going through the same thing I am. Also my personality plays a big role in it too. I'm a really shy person and I don't really open up until we've become friends.