Lord Snot
Parsley Provider
It's true that some of the richest writers are really quite terrible writers. It can be really frustrating if they're tackling heavy or interesting ideas, but they just don't have the skills to put it off.
Yeah I hate when an author has a great concept and really interesting ideas/plots but they just can't pull it off. Like Jean M Auel, if she had been a better writer then Earth's Children would be one of my favourite things ever.