I guess there's not much interest because Linux isn't very good. Urban myth has it that it's faster than Windows, more CPU efficient, and easier to use. Fact is, it runs slower than Windows using its native apps, far slower than Windows when it's emulating Windows apps, relies mostly on open source (which is to say, home-made) drivers for hardware that generally don't perform as well as the 1st-party drivers made by the hardware manufacturers for Windows, and is a pain in the arse to use. Take this for a neat example of how rubbish Linux is.
Please explain why being open source makes it bad... surely having as many people as possible scouring over code means its more likely things get fixed? Ever got frustrated when it take Microsoft months to spot a bug, let alone fix it?
And do you realise that most of the internet runs on linux/unix/BSD servers?
This site is running on "Apache/2.0.52 (Unix)"
Anyway, I've only briefly experimented with Ardour running with my interface through Jack and I could definitely see it at the heart of a pro studio. I'm definitely going to try my next live recording with it.
And for the record, you don't 'emulate' Windows apps. Wine is an actual implimentation of the Windows API on linux, meaning apps can run as fast as they would natively. I run Office 2007 on Ubuntu on my aging laptop and it loads Word about twice as fast as on my quad-core Vista workstation!
Drivers? Nvidia have supplied great Linux drivers for ages. ATI are getting better and have just announced that their next driver will support Crossfire and all the other fancy things which no-one uses. I've had no driver problems, in fact there were even the drivers which let me use my laptop's fingerprint reader instead a password (which on Windows would require special bloated software).
As for the Firefox thing, I switched on and the update was installed and ready for me to use

With a good package manager things are actually easier to install...
You want the latest version of Cubase? You go out and buy the CD, mess around with installing it, CD keys, activations, USB dongles, etc (all costing you money).
I wanted to have a go with Ardour, a highly advanced DAW. What do I do in Ubuntu? Open the terminal and type...
sudo apt-get install ardour
5 minutes later it was there waiting for me to use.
In the true words of Lipton's Iced Tea... "Don't knock it 'til you've tried it".