Chris Martin gave an interview where he talks about his T. It didn't seem severe at all. I don't know about Lars and the others. Just because they are musicians doesn't mean their T is very severe. There hasn't been any proven correlation between T severity and the severity of the hearing insults. You'll find posts in this very forum where people are in disbelief about the fact that they know someone who has listened to metal super-loud for decades, front row concerts every month, etc, and with no T at all, while they on the other hand have been very careful with their hearing, always liked quiet places, etc, and end up with severe T.
I can guarantee you that money doesn't help with T, in terms of treatment. It probably does help in the sense that it's one less thing to worry about in life, and since stress contributes to the perception of T, it probably sucks more to be broke with T than rich with T, but it doesn't help in terms of treatment.
If it did, you'd be able to show me a (working) treatment that a poor person can't afford while a rich one can. Sadly, you can't.
NB: I say "sadly" not because it's good to have healthcare inequality between poor & rich, but simply because if there was a working, expensive treatment, it would mean that in time the cost would go down and become available to the masses. That would be a ray of hope, at least. I'm sure you understood what I meant.