To show that they have foresaken their villages for the akatsuki.
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All Akatsuki members scratch their headbands as a symbol of defection from the village, although in Itachi's case, he was still loyal to Konohagakure, only joining Akatsuki to spy on the organization from the inside.
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he join's akatsuki after he leaves the village he contacts uchiha madara and he helps him to get into akatsuki
The Akatsuki are the 'bad guys' in Naruto, although They might not be in the fandom.
No, Naruto does not become part of the Akatsuki. He couldn't even if he wanted to because he has the nine tailed fox inside of him and the Akatsuki want to extract the nine tails out of him for Madara's 'Moon Eye'. It's not probable that Naruto will ever join the Akatsuki.