No, any additional characters you have on the same world can be transferred together to the destination world for the same cost. Standard subscription allows for 8 characters per world, so you can transfer up to 8 characters together.
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it's the same result for you - but not for the server economy as a whole.
the point is to not bring much new gil onto another server, wich could crash the economy. when you buy items for 10 mio on server A and sell them for 20 mio on server B, then you have doubled your money. but you took the extra 10 mio out of the gil-pool of server B - no new gil was brought to server B and the economy will stay stable. due to the taxes by buying and selling the gil-pool actually even shrinked, slowing down the inflation a little.