A few grand is what I would estimate on the high end to "do it right". Flying someone to Philly (a day ahead to check the venue) , hotel and paying them to admin the stream with reliable equipment.
I am not sure what ARC is I think it is a smart investment that isn't a whole lot out of their marketing budgets.
WB/DC/NRS have nothing to do with the success of the stream, don't put the blame on them.
NEC is a grassroots event, KombatNetwork is a community based stream that are local to the area.
KN also does not make money from doing this. If anything they lose money based on time spent/travel expenses/stream equipment expenses/bandwidth (since NEC is not supplying them with bandwidth however multiple other streams are running fine).
It has been mentioned a few times here and in stream that they are looking for a 4g card that someone in the community will likely have to fund from their own pocket.