I met a girl who was selling subscriptions for save the children once. Ended up meeting up with her later and asked her about the job. If I had signed up for the thing, paying about $20 a month, she would pocket the first three months. Not sure what her employer would take after that, but knowing they were flying these people around, paying for hotels year round, and probably taking a decent profit on top, I'm guessing I'd be paying for close to a year before any hungry African children would see any money.
They also frame it like you're paying for a specific kid, telling you their story and showing pictures etc, but it's the same picture and story they show everyone. Total scam.