How much of this is based on what we know and how much is based on what we think the problem is. It could be a myriad of things, really. End of the day his voice is gone but we'll never know how much he tried to fix it and what procedures he had. For someone who wants to make as much money as possible, it wouldn't be in his best interest to do nothing while it deteriorates, he feels like a guy that would go down every avenue to try it. It's his source of money, even knows that. Not the albums, not the wine company, not the investments, THIS is his best chance of a regular massive paycheque.