Well, they have a pretty strong economy there considering this, that x1 TC is worth $1 USD, and they are used to get in game items, 1m zeny is 1 TC, custom kaho is 60TC, custom bell = 35 tc, and mvp cards are 20, blah blah etc.. if you are meaning the actual value that is. Seems to be still pretty active there, usually more than 1300+ people on 24/7.
http://wiki.talonro.com/Reward+List for reference of item values