If you owned it you could reuse the characters in your own game, produce your own movie of the game and so on - not bad for a $50 investment. Think of the same with a book - you don't own the IP in the book and paying $0.99 on amazon doesn't give you the right to produce your own HP movie franchise.
Redigi's business model is exactly the same as you ripping your CDs to mp3 and then selling the disks, does anyone really think that people selling their downloads aren't keeping a copy?
You agree to a license to a piece of art work - you buy whatever the copyright holder decides is the deal. If that means only listening to it on an Apple hardware, only listening at home, or not letting your neighbor watch the movie with you - well that's tough, find a different artist.
The famous French scientist Louis Pasteur refused to allow his book on yeast and brewing to be read in Germany, he was mad at them for the 1870 war with France. It's his book - his rules. German beer doesn't seem to have suffered too much as a consequence (not sure what America's excuse is!)