You're A Musician - You have yourspace on the net, with thousands of plays, everyone is your friend, you're famous....but still broke.
You're A Blogger - You have your own website, you have many visitors. You'd like to profit, you don't like big scary ads. You'd like to share your taste with your readers while they visit.
You're An Advertiser - You buy banners, skyscrapers, make it look as loud as you can, and hope someone sees your ad, and clicks. And if not, you have to pay anyway.