You can buy warps. You can also purchase special items from auctions (which are only available at certain times; like when there is an event weekend and so on) I also believe you can purchase chunk loaders for modded (not sure on that one though)
Pretty much everything Doom said Except that it is official for Chunk loaders and Modded shops, a whole 5000 Coins. Worth it since its the only way to get chunk loaders on modded.