Comic-Con is the San Diego Convention center bottom floor filled with dealer booths and company booths and an upstairs of panels, presentations and card tournaments/other nerd things.

The dealer floor is quite expensive to get a booth at and its not really like a car show; it used to be a lot of individual toy and comic dealers but has mainly become an industry/public show for companies and new products.

Most of the porners are usually at the smaller booths with people selling stuff (the company booths rarely sell or just give shit away) with their autograph or picture the incentive to buy something, usually an 8x10. I haven't seen one there giving away a free autograph in some time, compared to AVN where everyones usually signing for free.