Assuming there is no wind factor, the weight is minimal due to most of the paper already being taken out, the average age of the thrower, the drag when the booklet flips open and the elevation of the stand. How far do you think one of these booklets could travel, what would be it's maximum speed, and what would be it's impact speed?
I reckon if I'm confronted with these answers, I'll piss myself laughing at the possibility of a grown man being scared of a fluttering season ticket booklet.
I think the only danger is if the corner of the ticket hits someone in the eye.
I think they should have issued everyone with goggles before the match, just to be safe.