I got absolutely no problem with stuff that is properly licensed (which isn't hard to do), but the grey area is difficult as it depends how arranged it is wether or not you can consider it a new artistic work on not.
I'm planning a CD of games stuff with a band at the moment, all of us agreed that we would offer the album for free as a download, but as a properly licensed CD also. Thus is people wish to pay for it, they can do so without loosing sleep. You can't say fairer then that imo.