True i read all the books so i know and i support her reasoning for that

That depends if you are a robber they might just give it to U.S spys

Being a fan of Harry Potter myself the first sentence is false. They are not easy to come by for wizards because he has the only real one in existence. It is the only one that leaves the wearer completely invisible and does not wear down. This is stated in Harry Potter and the deathly hallows.