Now that you touch on that and since I'm considering a role in C/C++ that came up to me.

How much is a good salary for that if you're remote (but US based) and have about 10 years of decent experience (plus a PhD in CS).

A good pay should cover your expenses, vacations and such, a bit of retirement savings, and leave you with some disposable money as well; otherwise, it depends on how much you want the job. (It's the same old supply vs. demand kind of thing.)

That's a minimal pay in a field where the job market is kind of in favor of the employees.

In my mind, this feels more like "acceptable pay". Excluding absolute emergencies, I'd never take any job as a grown adult that didn't check all these boxes.

Also true, but not the only reason nor a particularly relevant response.

High salaries won't magically make experienced C/C++ programmers appear out of thin air.

Sure they will, you’ll have to constantly compete for them because supply is low, though.