Re:"money" issue. Everyone has a hand in making an artist successful. Yes the artist produces the content and should be compensated for such. I fully agree. But Grooveshark brings the audience, the user experience, the hosting, and the analytics. These services aren't free. Do you get mad when people sell you tap water in a bottle and demand $3.00 for something that costs $0.25?
Fresh water is a limited physical resource, whereas digital products can be infinitely duplicated at little-to-no cost.