When the sun goes down, pick up your sleeping bag/blanket/whatever obstacle you lay down to "mark your territory". When others are trying to get closer, they will only trip over your stuff and potentially get it dirty. Yes, it was ME who walked all over your blanket... Yes, it was ME who kicked your bag while walking past you... Yes, it was ME who stepped on your toes when you refused to sidestep out of the way to let me pass.
It's a concert not a photo shoot. If you want to play amateur photographer, apply for a media pass. Otheriwse, your pictures are blurry, over/under-exposed, and all around useless... Your digital camera's LCD is distracting to those behind you and your flash is annoying for those in front of you. Enjoy the music and the visuals with your eyes, not your camera.
Who glued everyone's feet to the ground? This isn't a movie, have fun! Dance! Sing! Move! At least don't cut-eye those who do.
Ryan C at BlogTo summarized it quite well:
All around me were people standing still, staring at the two big screens [...] You people bored the living crap out of the bands all weekend long.
Think about it, $80-$125, and all you guys did was stand there, smelling of horrendous B.O. which is only excusable when you've been fucking moshing all day long. [...] if you're not going to move a muscle then stay in the back; you're standing in the way of a good rock show.