Personally, every time I decide "I'm going to check out this streamer's live stream" I always end up joining at some point where they're getting set up, they're taking a break, they're reading chat, they're eating soup... I've never actually tuned into a livestream I'm actually interested in.
Meanwhile, RTGame was one of the first gaming content creators I ever subscribed to, and all of his content is his twitch livestreams edited down to actually interesting clips or sections.
I enjoy smaller Twitch channels where the chat isn't going 1000mph because you can actually chat with other viewers. There's definitely a parasocial element if the streamer reads your message, but it's more that it's an online community with shared references and in-jokes.
Also the people I follow are mostly part-time streamers doing 3-4 hour streams a few nights per week, so they don't need many breaks like the ones doing all-day streams.
I'd say the audience willing to pay extra for that is very limited, especially once you move to lets say a very niche stuff, but oh boy they paid a ton. Live also means 2-way interaction, additional added value (and price).
Especially I think most people don't know about steaming, never watched a single live streamer, but if we filter them out, then among people who watched a live stream at least once amount of hours spent might be higher.