They come with a balance transfer fee, usually 3% or 4% of the total amount you transfer.

FORBES: Tips On Transferring Your Credit Card Balance To Another Issuer

The allocation of GST exemption to a transfer or to a trust excludes from the GST tax not only the amount of the transfer or trust assets equal to the amount of GST exemption allocated, but also all appreciation and income on that amount during the existence of the trust.

FORBES: Obama Estate Tax Budget Proposals

But far more important is, I'm not even sure how such a law would be effectively implemented, because there is a huge amount of transfer of funds around the world.

CENTERFORSECURITYPOLICY: Center For Security Policy