I've thought about that, and I think that could be the reason, but why would the bands say "no" when it could promote their song? Imagine all the people that would see the song, become interested in it, and start liking the band! :)
Why are there no major bands such as Metallica in RS 2014 in the DLC Shop? I just want to know why, I'm a skilled guitar player and I thing it would be good if they added Metallica or something of that sort. Tell me what you think!!! :)