Some interesting stats (that I make up on the spot right now, watch me). Statistically half the people in Australia almost never use the net. Those that do use it to read Microsoft.com or TheAge or something. Statistically almost no-one uses the net to listen to music. Of those, most of them probably listen to FOX-FM and like Britney Spears or maybe Powderfinger if they're alternative and have punk hair. Of the ones who might like your music, most are probably not going to go to much effort to listen to a band they've never heard of much less stream or download your track. So what I'm saying is, even if you had fans, most of them wouldn't go to your website to listen to your music.
The only reason to put music on the net is that it's an alternative to CD. You can send people there to listen to your music. It's an online demo tape, or a cheap alternative to a small CD pressing. Infinite people can listen to it and it costs you almost nothing. No sucking up to radio. No air dropping of CDs. It's just there for whoever can find it.
There are no other reasons. Selling your music in some weirdo digital format? Whatever, maybe one day it'll work but not now. Giving your music and paying for it in donations? I know of one example where that is reported to have worked, but I doubt even that. But good on you for trying.
It's there, and anyone you point to it who is interested will find it. Yay. But if you're still going to have to gig, press CDs and send them to radio and cross your fingers because music on your website is nothing to anyone but you and your friends and weird crazy bored people you probably don't want listening to your music anyway.
They have pictures of your cat too.