YOU GET 30 SECONDS
Google now has a search feature for rock videos. You can check out a favorite artist and watch thirty seconds of a rock video. Then you're told: "The download is $1.99."
They aren't giving it away. They gave you enough so you could check the quality and make a decision on whether to buy it.
If you don't think it's worth it, or if you don't have the money,don't buy it.
Same thing at amazon.com or iTunes. You can hear a 30 second sample. Like it? BUY it. That's how the artists and their partners make money. It's a business.
30 seconds is all most artists want to give away free.