I think a good concept to add to the game would be "Tokens". Tokens would work as another currency, that allows you to buy different items that are token exclusive. Tokens could be obtained a few different ways, such as buying them for a very large amount of gold, or there could be a low chance of getting one from the daily assignment chests. Tokens could be used to purchase exclusive stitching gear, houses, and even mounts. Tokens would be semi-hard to obtain so the prices for the items would not have to be too high. The vendor could be an owl, like Gamma, that resides inside of the statue that sits near the entrance of unicorn way. Tokens could be free to get and what I think would be a great addition to the game.
This could work if implemented carefully. We already have gold, crowns and tickets, but I think this could be a good equivalent to scrip in P101. I've often thought that we should have some sort of loyalty reward system that would work for both members and crowns players, and what better way to implement something like that by just making a special currency available for anyone who is still actively playing the game and doing things like exchanging gold for tokens, daily assignments, etc..
I personally do not feel that it is necessary. No need to add tokens, dubloons, rupies, dinar etc. There are already enough if not too many currencies. Curse you Arena Tickets!