demand for some events is just greater than supply, well except for Charger games
Packers have a long list of people waiting for season tickets, and they turn over about 90 per year. Coachella sold out two weekends this year to try to help out music fans. SDCC is doing what it can to stay put, increase attendance, and get new people into the show. Right now, the ball for keeping the show here is with the politicians to either stop or proceed with the expansion plans.