I don't usually repost stuff on this blog (we have the "What we've been reading"-feed for that in the sidebar). But this is so well written, that I feel everyone who ever used GPL software should read it: Best JED response ever (hat tip to ninjatheme for the find).
Speaking as a developer of GPL software myself: when faced with (however few) users who demand your full undivided attention because they feel you owe it to them, it can be very tempting to relicense your software under a more restrictive proprietary license.
Dear user: If you care about Free Software (as in Freedom), allow GPL developers to make a living. If we can't build viable GPL-based business models, open source software will never amount to more than mere hobby projects.
From the Free Software Foundation website:
Free software is software that gives you the user the freedom to share, study and modify it. We call this free software because the user is free.
