Quite a neat insight and somewhat confirming what I think personally; Linux users largely don't use Linux for FLOSS reasons. People who do use Linux for FLOSS reasons are however rather loud. I would probably not be wrong when saying that most Linux users will happily pay a developer for the binary of an application if the dev is "doing it right". Doing it right largely involves "don't treat the customer as a walking…
You may see GNU folks as crackpots, but in many aspects they are right, for business reasons.
I have an increasingly hard time to admit in my core stack anything that is not open-source (even if not free-as-in-freedom). Commercial offerings come and go, change their terms, etc. They can do something that goes contrary to my interests, and I have no recourse, and nobody has.
This is on the top of problems while troubleshooting. Being able to look at the source, understand what's happening, and maybe even quickly patch it is indispensable when running a production system, and suddenly encountering a problem.
That is, I don't use open-source programs because they don't cost money. E.g. I've donated more to Mozilla than many commercial products cost. I happily install paid versions of open-source apps on Android, as a way to pay the developers. I won't mind to buy paid support for open-source products.
But the openness is very important for something that is not a quick fix for a temporary problem.