That's a ton of money to you and I, but to him it's not. He's already made tons of money. He's either betting that he'll get a much bigger deal next year in free agency provided he stays healthy, or he's not doing it for himself but is fighting against the system that pays RB's less than other skilled positions. I very highly doubt it has anything to do with drugs. Part of the madness could also be him trying to ensure the Steelers don't slap a tag on him again next year. If he creates enough chaos, it likely ensures the Steelers just wash their hands of him. Or he was hoping they'd rescind the tag.