Disliked{quote} You dont have to have all money in FX account. But some of us, like me for example, measure leverage as a leverage of whole investment portfolio, and not some little FX account. For second, transaction costs of moving cash in and out of broker aint actually small, as most of banks (at least in Czech) have spread @ 2%. So...Ignored
The only rule I'd think applies to anyone and everyone, is not to have all of your money in your investment account.