"So what would happen if after the 10 posts people found someone to not be a person that should belong."
Really, not much might happen.
Unless a new member is totally a flake or extremely unruly/rude (which has happened recently with a certain young member), it happens.
Those kind of peeps get weeded out relatively quickly, even though there may be many posts explaining why the new member is making a mistake, yet not heeding excellent advice. When I state "weeded out", that doesn't mean banned or expelled from the forum. Only that anyone with that kind of attitude will not find many forum 'friends'. Therefore not get many replies. It's a two way street, basically you be nice, you get nice in return.
Your posts have valid questions that deserve answers. I hope that I have helped in some way with my replies.