Went to the Roger Waters concert last night. The lines to get in were a block long so we were directed to Gate 7 for a supposedly shorter wait time. Two arena employees there told people to go to Gate 4 for a shorter wait since only 2 ticket takers were staffed at 7. At 7;55pm (5 minutes to start time) a 3rd ticket taker was added. Apparently they can't gauge the number of tickets sold to determine proper staffing. Luckily the show started about 20 minutes late so we didn't miss the beginning. People were still coming in when the show began.