After some thought, consider that an elite cannot reincarnate, or any other human for that matter. What could be happening is at some time in the hybrid bloodlines history, a pact was made with the demonic realm (possibly even with Lucifer himself) by a bloodline patriarch. This unholy pact binds the entire bloodline and its posterity to Satan and as a reward,great earthly riches and power will always follow the bloodline for those that accept demon possession. It is the powerful demons that possess these bloodlines that are given consent to continue to possess the members of a bloodline. This is why these bloodlines obsess over the purity of their lineage.

Or something like that...