Money is a tool, merely a medium of exchange.

Don't hoard your money, instead use it wisely.

Even the best tool, sitting in a toolbox unused, is worthless.

It's a gauge of the "exchangability" of one's work.

I've seen amazing examples of this from both ends of the spectrum here. There is some really impressive work people do and there are impressive examples of the level that people will stoop to.

Your dedication to work through your injury is a good example of the upper end of the spectrum. And, I think you actually enjoy what you're doing, it's not all about the money.