Re: Cost is the smaller concern
I'm puzzled why you assume that support of closed source code should not be done free by volunteers.
Or alternatively that you assume that people willing to pay for work on closed source code would not be similarly willing to pay for work on open source code. Hewlett Packard's experience, relayed by their VP for that, was that most FLOSS is written by people who are paid to at least in part write code, and that HP could make a profit out of maintaining/developing FLOSS. Not everywhere, but where they sold that service.
It is one of those memes that goes around and seems to indicate either thinking failure, or an attempt to mislead.