This is what you may buy:
250: Name Change
500: Adventure (one at a time)
1k: Gift from the Red King
2k: Endowed charrie(Not yet but soon)
4k: Extra Character
5k: Extra Endowed charrie
10k: Magic Item (like Charlie's wand or the sea urchents)

K=1000 coins

You get 2 coins per post and 5 for a new topic. Also 100 coins for top posters of the week and 400 coins for top poster of the month. Mods/Staff members get paid with coins for helping the site stay in calm.Below is what they get paid.

C-box mods = 200 coins
Mods = 500 coins
Staff = 650 coins
Elite Staff = 1000 coins