What is the relevance of that part? Your claim that open source projects can't be sustainable is straightforwardly false, regardless of whether there are any Linux developers who are payed by other developers in order to use Linux-based software.

Similarly, your claim that "open source folks" don't value open source software as worth paying for is straightforwardly false, regardless of whether they pay out of their personal bank accounts or push their Fortune 500 employers to donate money and time (which every Fortune 500 calculates in terms of money).