He doesn't need or want it to make money, he's got South African mine money that he didn't earn to waste. It's a toy, one he knows other people like, so he's currently taping M80s to it just to be a dick, because he feels he can and that he's entitled to.
Now the question: is Elon such a dick that even his own father won't speak to him, or is Elon's father such an even bigger raging dick that Elon won't speak to him? I shudder to think how awful he'd have to be for that...