Because I have ideas I feel could shake the news industry up, even if it's just for a small niche of people. I don't really want to be a "me too" site.
One could shake up the industry with something that leverages blog software. Another could write an amazing piece of news-displaying technology and not make a dent.
I can't find this. So I am considering building it.
Orrr in a few weeks if you go at it alone.