I'm still weighing the pros and cons of whether or not I even want to try for a limited autograph. I'm not big on camping out in the humid San Diego weather, let alone camping out for something that isn't even guaranteed. But the once-in-a-lifetime opportunities...! Ah, decisions, decisions.
FWIW, when we did it last year, we had 3 people trying for the most popular drawing (a Horton Grand Panel). We were in the front area of the lineup (the stalls across from B20) but toward the back of that. With our 3 people drawing, one got one pair of tickets. 2 of us went back in the line to redraw and one went to the GRRM autograph draw. On the repeat, we got one GRRM autograph ticket and a standby ticket (pair) for Horton Grand. So the odds weren't too bad.