I wanted to live stream a Scenario, but I just couldn't get past the ability of someone to use it for cheating.
The live aspect of it has appeal to people that watching it on a 3-hour delay doesn't have.
Also, some folks want to interact with the person who is streaming. So if you did it on a 3-hour delay, you would play in the event, then spend all that time again sitting there being available for people to interact with once you do show it.
I really wish I could live stream a Scenario.