I think it would fall along the same lines. Or more specifically, it would be like someone who has basic cable, but pays extra for sports channels or something (I don't watch sports, so I don't know if they cost more, but I always see advertisements for sports packages *shrug*).
Personally, given that WF guilds don't stream live attempts and first kills (understandably),there's no other reason I would have for paying anything extra to see something that has 1) already been done, or 2) doesn't interest me that much (pvp). If I was hardcore into PVP and wanted to see what some of my favorite players were doing, then I might consider some sort of paid stream. Only if it was reasonably priced of course.