A bot page exists to just repost content from the control page. So, FAN PAGE X posts something about Hillary. Then bot pages automatically repost that.
Because several fan pages that are similar to Fan Page X reposted that Hillary image, the Facebook algorithm then thinks that image is popular. Then shows it to people similar to the fans of Fan Page X.
Metcalf had 8 pages doing that for his 1 central page. Shapiro has 14.
Shapiro has 14 LIkes & Shares guaranteed for each piece of content. That's 1000's of impressions several times a day.
Imagine if you had 14 alt accounts for ImgFlip that automatically upvoted every meme you posted. You'd put Raydog in the dog pound in a month or two.