Its the same as if you went into Mcdonalds headquarters and tried to push "your" new hamburger idea on them!! Even if you could supply Filet Mignon's for cheaper than what they get meat for now, and ask to take a ridiculously low cut of profits- they would still tell you fuck off!!!! As long as they control the distribution channels, they control the game!!
Sure we have ways of doing self promotion these days, but its still like trying to compete with Mcdonalds with 30 Hamburger stands in their sea of 100,000 locations. Musicians are like super models now, they just so happen to be a pretty face, sound good, and follow directions well- they are all industry trash from stage moms/dads!! Isn't technology awesome?!?!?