On the stadium atmosphere, I think its us that get most from it tbh. I used to drink with a lad that played Union for Wales, and the biggest crowd he played in front of was ~50k. He said it was deafening when they walked out and overwhelming when the anthems etc were played, but the moment the whistle went he couldn't really hear anything because he was so tuned into his teammates voices. You could hear stuff when the ball went out, or try scoring moments and that, but generally he said he could have been playing anywhere when he was actually involved in the game. Im pretty sure footballers are the same. Its why they probably say how great the support was if we win, they only really experience it at the games biggest moments.