Maybe because of this guy! But here is a list of locations that Selfie Sticks are banned:
-No Disney Parks...Worlds, Land, Quest, Sea and Water Parks included
-The Roman Colosseum and The Vatican
-In England...Westminster Abbey, the Tower of London, St. Paul’s Cathedral, the National Gallery and Buckingham Palace.
-No Yankee Games in the city, as well as...the Met, the MOMA, the Guggenheim and the American Museum of Natural History.
-Other U.S. locations include...the Smithsonian in Washington, DC, the Art Institute of Chicago, the Museum of Fine Arts Boston, the Getty Center in Los Angeles and the Seattle Art Museum.
-Even Festivals around the country say NO! (but again, I think they are just trying to keep that guy out from the pic above)...Coachella and Lollapalooza banned them, as well as Comic Con in San Diego, and even the Kentucky Derby