If you had a robot that could stow, pick, and pack any item in a warehouse, I have zero doubt you could negotiate $10B, simply for the fact that you could get Amazon, Staples, WalMart, Google, JD.com, Tesco, and AliBaba into a bidding war...and if none of them decided to pay you $10B, you could just offer your own FBA-like service for a fraction of what Amazon charges and make your own $10B.
Amazon is acting like a Pawn Shop owner taking advantage of the guy with the original Picasso by telling him that it was a common forgery. Nobody in their right mind should sign up for these contests, and it pains me to see intelligent people duped into it for "the exposure".