It's to limit the amount of "spam" all over the forums, you can blame people from 1.0 who had no active service accounts but kept trolling the 1.0 forums until they finally decided to make it so you had to have an active service account to post on the forums, the limits for low levels will not be noticed once you start leveling as it barely takes any time to get up higher. For now you'll have to bare with the limited number of posts outside tech. forums.