Yeah, I have no problem with anyone selling a premium version with extra features, because I don't really agree with the idea that everything should be for free. That said, if you're a programmer I don't think it would be too hard to extend the idea to other bbcodes.
BTW, if you do it yourself starting from scratch you should know that the message part of the posts are cached to prevent having to process the bbcodes every time someone views a post. So it would be almost as easy as saying "if (guest) don't show this", but you also have to make sure the post doesn't get cached.
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