Have you considered that x.com might have been an impulse buy (at the market rate, I might add). He could set $40b on fire and still be one of the richest people in history.
I also don't get the hate around that site - it's still very much up and running.
Maybe this site hates him because he trimmed a ton of fat in Twitter's engineering department. Maybe people on the left hate him because he's living proof that some people are just competent. People on the right used to hate him because he's anti-oil. Maybe the tallest trees just catch the most wind.