Good post mate it's always beneficial to exercise the brain to form fresh ideas and opinions whatever the validity.

So this theory sprung into my thoughts also, I came to the conclusion that we are simply vessels for the "Aliens" So I think they perhaps rent a body for a period of time say 80 years , have the "human" experience then they return the place they came from.

Different options would be available to tailor your "human" adventure.
For instance for a more difficult existence, you could select the starving African option or for a more diluted package you could go for the Biber plan.

Just think If the "Alien" beings had a life span of one million years, 80 years is the equivalent to a weekend in Amsterdam.

It's as good an explaination as any.