Actually, I agree with Prince. Consider it from an artist's point of view. You work hard to be creative, and you put in long hours to pay attention to details that make most of world's collective eyes gloss over in a matter of a few minutes. You rehearse, listen to what was produced, trash it because it doesn't capture what it is that you want to express, and you start over. After months of work, you have a finished product, and then what?
Do you perform it only in public shows, do you release it on physical media, do you sell it through iTunes or some other comparable service, or do you put it on the web? From the perspective of the artist whose sole compensation for months of work comes from the sales of his artistic product, why on earth would he want to put it on the web? Yes, it might make one more popular to give away things to people who incessantly try to find ways to get everything for free, but there is no payback for such beneficence. They won't pay for concert tickets, they won't pay for CDs of the music, and they won't even pay for an iTunes copy. They always want it for free as if the work output of artists is a kind of nationalized resource from the old Soviet Union.
Bear in mind, too, that artists don't get 100% of the proceeds of such sales or anywhere close to it. There are media production companies, distributors, advertising agencies, agents, associate artists, staff members, security personnel, and staff members that have to be supported by those sales. So, while it might seem that the flamboyance of Prince implies that he just wants to suck the financial teet dry, it hardly the truth. He simply wants to protect the investment of his own life into his own art. Whether we like or dislike his work product is not the point. He has a right to protect what is rightfully his just as we would have a similar right to protect a house that we have built, a career that we have honed, and a family that we love.
Art should not be free unless the nation as a whole is willing to pay for all the expenses required to support the basic and extended needs of artists. We do that for postal workers, public employees, and, to a limited extent, medical professionals. Even if we were willing to do it, however, artists have the perfect right to refuse such arrangements.
I suggest that people become a tad bit more honest about the conflicts within their own personal value systems with respect to what they think they should be getting for free as opposed to what it is they should be required to buy. If they would do so, I sincerely doubt that the kind of namecalling and libel that has appeared in the forum with respect to Prince would appear at all.