Building the future is expensive. If Elon ever really needs the cash, he only needs to ask. I'll be there to open my wallet for him and I'm sure many others will be too.

I wish he'd give up on his Mars mission plans though. He's just not bankrolled for it. He ought to be focusing on mining the moon and near earth asteroids. The first company to do that will probably be the richest company until our species dies out. That would give him more than enough cash to fund his Mars retirement plans. It bothers me slightly that he can't see that. Unless he's angling for some NASA funding; then it would make sense.