Just saying... I don't think they were serious. The 10 billion offer was either a lie or just to catch everyone off guard so they can't bid anymore or to start a conversation. I don't think you should accept it since it's honestly impossible to hold that much cash (I'd know), but that's my opinion.
Notice that he's nowhere to be seen now?..
He might have multiple characters, or have bells sprawled on the groung. Remember, in the very beginning before it got out of hand, he said he ONLY had 700 million not 10 billion