Timothy, you are slightly misinformed. All Red Hat products (enterprise and fedora) are licensed under the GPL.
See http://www.redhat.com/software/rhel/faq/#4
I'm not sure your point remains viable after accounting for that flaw in your analogy.
A more general comment is that the opposite of open source is proprietary. Open Source software can be, and often is, professional and commercial. Both Red Hat and our very own Moodle being perfect examples of how these (commonly thought) opposite concepts can coexist.
Likewise proprietary software can just as easily be amateur and non-commercial so it does professional and/or commercial open source developers a disservice to imply that they are necessarily amateurs and that they are producing code that is not commercially viable