Are you saying it's
not possible for me to go out, spend $250 on a computer and $25 on a mic, and record myself playing something and upload it? It's not difficult to get to a quiet area and play a song for 3-4 minutes

Likewise, using tools such as Audacity to clean the music up and make it sound better isn't to difficult if you know how to use the tools. Will it sound as good as if i spent thousands and thousands of dollars on ultra-high end audio recording equipment? Probably not. But it'll sound as good as if i had a V0 rip from a CD.
Guess what: I read reviews, i follow artists sites and get alerts. I do all that. Yet i still want to hear the album before i buy it. Know why? Because when something costs $15+ (excluding tax), I want to make sure it's worth spending my money on it before i do so. And $15 is assuming it's a modern pop cd. If i want to import something from Europe (Where its much less likely i'd hear about a band through a review / another artist), it's even more expensive.
Look at Open Source software if you want to see stuff happily and freely traded. Samba (Share files with a windows computer from Mac's), ipfw (OS X's firewall), Apache (Webserver OS X has running), cups (You like printing stuff, dont you?) and more -
http://www.apple.com/opensource/ for a list of Open Source - "Freely traded creative works" that authors happily watch being used and traded - and someone else making a profit with. And these people are the creative one's. The innovators.