Well, to be quite honest and blunt, why would Apple want to spend more money on using someone else's technology to stream an event to someone like yourself, who continues to bag on Apple all the time about how smug they are and isn't likely to buy any of their products anyhow? I can't even imagine how much money Apple is spending already to stream this. Add in the overhead for doing Flash based RTSP streaming (that works poorly behind corporate firewalls) and that cost would skyrocket.

I was wrong about one thing, Adobe does also support HTTP streaming with Flash. http://www.adobe.com/products/httpdynamicstreaming/ No idea how open their implementation is though. Adobe says open, but I can't find a spec sheet for it with the IETF or a similar group.