Automotive equivalent of stating "my sister smoked until the day she gave birth and her kids turned out fine. Therefore, all you folks who think smoking can harm a child are worried over nothing."
There is risk in posting a VIN in a public forum. One of my personal friends had his RX-7 stolen as a result of doing it. After the thief was arrested, he confessed that he had a key cut at the Mazda dealership with the individuals VIN (which the owner had listed via the the internet).
RE needing a registration. That's not the case - I've personally cut keys for friends without them!