As somebody who is currently going through this, I can understand why you're doing it, but it is very annoying.
One of the nice things about joining a forum is the ability to instantly communicate with other people about a topic you enjoy. With this 10 post rule (that doesn't seem to get checked that much btw), it's incredibly frustrating to know that by the time my post has been approved, the topic is already a page past that and people aren't going to see it. Personally, I would suggest lowering it to 5, or just using some common sense. If a person's first couple posts don't look like trolling posts, then just admit them. The 10 post rule is stupid imo, but I have no say, so I'll still listen to it.