If so, then it has absolutely no place in this century. Transferring numbers does not get more difficult when the numbers are larger, and any percentage-based system is unjustifiable. Transferring numbers is also terribly easy now, so such a service does not even warrant a significant flat fee.
We are rapidly moving toward a situation where virtually every single transaction in our economy gets skimmed by banks for 5% or so. This is giving a ridiculous amount of economic control to banks for absolutely no reason.