It seems fairly arbitrary to me what decorations are coins or credits. Why is the mace for the medieval theme 10 credits and the torch, axe, sword, shield,etc. coins?? I think there should be a coin option for all items.

Our guys here are monitoring the differences in prices very closely and base them on a variety of different factors in the game. There will be lots of things to buy as the game grows using both credits & coins, some new ones popping into the game very very soon!