I only saw about 3-4 people. Not many, but I agree about the responsibilities part.
I honestly think these wont be hard to copp if you really want them.
I believe the parking lot on union square is $3-$3.50 an hour. I walked over to Niketown during lunch and there where people just standing around inside the store looking at their iphones. (I'm assuming Twitter or Facebook for the wristband info)
Here in San Francisco, they ask you for your size at Niketown along with your personal information (ID). Once you get the wristband, you have your pair on lock as long as you pick it up on Saturday before the time stated by staff.