This is the most popular shrine in Japan and three millions people visit there in three days of New Year season.
By the way, we throw into a box, called saisen-bako, to pray for gods. We used to present some kinds of foods to the gods because the gods are the ones of agriculture. The food change into coins perhaps because it is hard for people working in shrine to clean up the rotten food.
People throw coins, which are about from 5 to 100 yen. Some of them present a 10000 yen bill. Assuming that a person give 10 yen to shrine, the shrine get 30 million yen in three days at least.
I really recommend you to wear some clothes with hood and you to pray just in front of the box for the coins. Some of prayers throw coins towards the box but the coins don't reach the box. If you are lucky enough, some changes can slip into your hood. ..
Oh, I seem to be impious....