Then why aren't they being marketed?
There's probably a lot of little reasons. I'm not in the music industry, so I can only make guesses. And, its not as easy to make guesses about today's music industry as it is about the music industry as it existed before the internet. Think about this though, before the internet, people found out about new music through the radio. Any given radio station has a limited amount of songs it can play in an hour. A certain percentage of that time goes to older songs that used to be very popular. Another percentage goes to the songs that are very popular at the moment. Which only leaves a little bit of space for new songs, so there are only so many new bands that can be marketed at one time. So there is only room for so many new bands at a time, and those slots are filled based on what the industry believes will sell.
You might ask yourself why so many record companies rejected the Beatles. They apparently only got accepted onto Parlophone because Brian Epstein made some threats about pulling out of other business deals. Brian Epstein then bought 10000 copies of love me do to make sure they charted locally.http://www.billboard...007972812.story
Basically, he made a bet on them when record companies weren't interested. And he turned out to be right. Without him ramming them through the system, they never would have gotten a chance to be heard. Once they were heard, their talent took them the rest of the way. Even then, their early success was more boy bandish, and they only managed to become more artistic later.