If you think very highly of MPITT and his talent, feel free to make a post about your feelings and share them with other players on the board.
Starbond prices/TAG relate to the box office that their movies have made, and will make. This is mostly pure mathmatical and has nothing to do with players opinion of the actor.
MPITT has not made a movie in two years, and has no upcoming projects listed. Players are not very interested in trading his stock because there is no way to profit. This does not say anything about the actor, it says about the stock.
When you post news, repost the same news, and post really old and outdated news, you are becoming a reporter and you are responsible for the news you post. Posting news affects prices and players decision whether to invest in certain stocks or not. News has already been reported and players have already taken action based on the news. You come in here three years later and repost the same news, it makes players think that something new has happened (when it hasnt) and makes them rethink their holdings based on wrong information.
Your posts are being erased to keep players from thinking what you are posting is new news and having them taking action based on your posts.
Again, if you would like to make a post about how great of an actor you think MPITT is and you would like to talk about the actor, you are more than welcome.
When you repost old information it affects the stock prices and needs to be erased. When you keep reposting the same information again and again, it is called spam, and needs to be erased. If for some reason you are reposting old information and/or spamming in order to get players to invest in the MPITT stock so the price will change, this is called manipulation and it is cheating and people who do this are usually punished.