Furthermore he's been funny with his companies' finances. Between Tesla, Solar City (remember when Tesla bought Solar City, because I do), and the fact that SpaceX needed NASA to bail them out with the falcon heavy should tell you all you need to know about how solid his companies' finances are. Tesla as a company, the forefront of Musk's empire (arguably), is showing signs of business turbulence. Layoffs, benefit slashing, etc.
Now, I don't think he's really tried to scam to anyone, sincerely. He's a businessman who's bit off a bit more than he can chew in the science department in my opinion.