I’ve heard the Live+3 ratings are looked at by advertisers,
Looked at, yes. Cared about as much, not so much–at least as much as Live or Live+SD. There is still a chance in Live+3 that people will not fast forward though commercials
Also, keep this in mind. They might look at the Live+3 and not like what they see, i.e: they will see that more and more people are watching after the fact (even up to 7 days after) and not live which is a turn off for ad buyers.
I should note that Nielsen boxes can tell when Nielsen households fast forward while watching via DVR, so if they were wise and cared about the fate of their shows, they would watch the commercials during DVR playback. I don’t think the ones who skip commercials are even included in the Live+3/Live+7 ratings for that reason.
You think they are weeded out? Do you have something to confirm that, cause that’s not something I’ve ever heard. (not doubting, just curious)