Cosplay Girls, San Diego Comic-Con 2013, California, United States

Capacity attendance at Comic-Con in 2006 and 2007 has caused crowding issues. Concerns have been raised that the event is possibly too massive for the San Diego Convention Center, Comic-Con's home through at least 2015. In 2006, Comic-Con, for the first time, had to close registration for a few hours on Saturday to accommodate crowds. In response, for 2007, Comic-Con introduced a new three-day membership that did not include Saturday. Nevertheless, the 2007 show went on to sell out Saturday, as well as Friday and Sunday for the first time. Additionally, both the four-day and three-day memberships sold out for the first time. For 2008, the three-day memberships were abandoned and the convention decided to sell memberships only in advance, with no on-site registration. In 2008, all memberships were sold out before the convention for the first time ever. This sellout has given rise to the new phenomenon of Comic-Con memberships being scalped for exorbitant prices on websites such as eBay and Craigslist.
In April 2008, David Glanzer, Comic-Con's director of marketing and public relations, commented on the organization's desire to remain in San Diego:
We've been approached by other cities, but I don't think anybody wants to leave San Diego. I certainly don't. It's a perfect fit for us. It's expensive, whether it be paying for the street signs that tell you what streets are closed, or for any police or the hall or any of the myriad things, it's expensive. But it's a great city. There's been some talk of expansion of the center, which we would certainly welcome. Hopefully if everything lines up, we will be there for many more years.
Heidi McDonald reported on her blog The Beat as of October 7, 2009 Preview Night for the 2010 show has already sold out. Glazner explained the early sell-out: