Hi Johhnny!

I think you've hit it on the head:)

"Many alternative bands with musician strong songs to most ears will only sell so many units"

I think this is right on too. Sometimes there is just not enough of an Audience to make some of the more Alt.Bands more "Mainstream."
But I will say, a Hit Song will make all the difference!
They are the deciding factor in all of this.
They will cut through anything!

The Record Company along with Radio MP's(Music Programmer) may ultimately decide what makes the Playlist at Radio, but it is ultimately what the Buying public will support.
-Dana