Both video adverts and traditional banners can be a lot more expensive on that, depending on the situation. In my line of work, for example, I never see banners

Both video adverts and traditional banners can be a lot more expensive on that, depending on the situation. In my line of work, for example, I never see banners for less than $0.003/view, and $0.02/video advert is considered cheap. As to whether advertising can cover streaming costs - yes it can, certainly when it comes to gaming content.