Couple reasons:
1. The bandwidth is VERY very expensive. I realize that there are folks out there running servers already, but the reality is that the traffic this site might drive to feeds directly could be very expensive.
2. There are already some good providers out there... SBN, ScanAmerica.us, et at.
Don't get me wrong, I'm looking hard at a business model to support such a platform, but right now the model is still evoloving and I'm still considering if it makes since for radioreference.
Also, note that my efforts to stream Katrina operations 3 years ago netted me a 3K bandwidth bill... ;-). Now before all the experts jump my sh*t telling me "my host provides such and such" don't worry, believe me, I know. Dime a dozen, etc, et al... blah blah blah.