One egy it is how Oanda do: let the ppl trade 1 unit, no spikes, almost apparent everything, very low spread, they will attract beginners and they will drop money, but not instant. Since they had a feeling of enjoying somewhat longer, than restricting to 10,000 minimum units they will refill that they account. You may take a satisfied customer ( well, at broker side, not in software ) that will bring his money in system and no need advertising. I would say this is a win/win situation, however in practice that they aren't using they software (software quality improper...