We have coins here for a reason and I don't think they should just be limited to the TTT server. Maybe you could intergrate both similar to the rubies you have an option to pay in coins or the new currency.
Edit: I do like the idea of the sperate currency to allow for some skill in gettting the items, but I think it would be nice to be able to pay with both. Allowing people who have coins to use them and others who do not to try and use their skills to get the other currency is nice.
ORRRR you could use coins to buy new currency as well. Such as a currency exchange.<<<<<<<<<<<<<<<<<
Edit: I do like the idea of the sperate currency to allow for some skill in gettting the items, but I think it would be nice to be able to pay with both. Allowing people who have coins to use them and others who do not to try and use their skills to get the other currency is nice.
ORRRR you could use coins to buy new currency as well. Such as a currency exchange.<<<<<<<<<<<<<<<<<