now that they have clustered the old servers together in Ywain, it is now easier to transfer monies between the realms, many players are searching for some one to help exchange platinum from one realm to another, but like in real life, you have to watch out for the con artists who take your money and run...
another way is to use one of the platinum selling game companies out there, there are several different ones operating on the internet, that are pretty reliable. and have quick delivery of your ingame plat.