I'd imagine it's more to do with cost... but you would think if they offered online streaming only at a charge then it would make it viable for them to do
Maybe they just think it's pointless? I mean I used to like watching live feed, but to be fair you never really got to see much, so much of the time the sound was cut & often it would focus on someone or something completely uninteresting. I know a hell of a lot more goes on in the house than is shown, but they do show the "best bits" in the hilights show, but of course they can easily edit it in a way to favour someone with more/less screen time...