HaileySimone
✈ IN THE AIR ✈
It helps a lot, more than you know it. Depends on whose saying the shoutout, though. If they have a small audience, then it probably WOULDN'T help XD
especially if the shouter is someone already established or well-known. However, if the shouter is someone who is quite small, then it would help a tiny bit, but nothing worth writing home about.. 
It depends purely on three things: The subscribers, the type of video, and the person making the shoutout. If that person runs his channel like a cult, and his viewers do whatever he says, then you'll get views for a shoutout. If the subscribers only need one person to get their fill of that genre, then shoutouts probably won't work too well.I've just been wondering for awhile. I saw a guy on a chatroulette video which the uploader has 1.5 million subs on the channel, and he gave a shout out to someone on the video who does chatroulette videos aswell, and well, it did not help him at all. i mean holy crap, i WISH i could get a shoutout from someone with 1.5 million subs. but what's the point if it doesn't work? meh well i'm just starting out on youtube and i think i can get a shoutout from a guy i know who has 30k subs, but would it even do anything? haha