Take the Pepsi challenge...
Go up to any 100 random people with MP3 players, and see what percentage of their music was downloaded from bands distributing their content for free - the stuff is all around, MySpace is crawling with it, and several download sites specialize in author-donated music. Yet you will find that way, way less than 50% of the music people listen to is freely distributed. The reason? Most of it is crap - mind you, I said the majority, not all. Most bands giving their music away couldn't sell it to save their lives.
For that matter, try to make some music using Linux. Go get the most recent version of Ubuntu Studio edition to make it easy. Nearly all of the synthesis programs (Freebirth, etc) included are also crap compared to commercial pay applications like Absynth 5 or Reason. And difficult to integrate? No, nearly impossible - whereas most commercial synthesis hew to the ReWire protocol, under Linux it just doesn't exist, nor does anything like it. And I won't even start on the mess that is Linux sound standards...
How about news? On one hand, you can get unlimited free "news" from the blogosphere that is usually so biased and one sided that it is an affront to democracy - or on the other, you get commercial news sites with strong editorial content and writing standards.
Sure, Gimp is good, and Blender 3D even better - I use both. But again, they are diamonds in the rough, not the majority - and both have user interfaces that take a bit of getting used to, to say the least. And OpenOffice is a nice suite - but please remember that Sun underwrote a fair bit of it to get it to that level of polish. And who knows how much longer we can call MySQL open source? (At least there is PostgreSQL).
I have Ubuntu or Debian partitions on nearly all of my machines, and I am writing this on Firefox under Ubuntu right now, on my IBM T60. And I spent most of the afternoon doing a Joomla install and testing some site designs. So it's not that my comment was made out of ignorance of open source software - it was made in view of statistics, and including free media not just free software. I bought my first PC in 1982, I've seen the industry evolve, and I stand by my statement.