[xdude]

In extreme cases yes. But it rarely happens since you can't get away with that kind of stuff when it comes to domain names. You can complain ICANN and domain registrar and get it sorted out and bust the thief too. Also in most cases its about domain re-sellers and registrars who try to increase the number of domains under them. If someone stupid enough to fall for this kinda trick then they would pay high renewal prices without thinking much. I have seen that happen.