Everyone uses the same margin that is determined by the exchange. It doesn't matter if you equity is $10,000 or $1,000,000. e.g If you hold one Gold contract you both pay $5739 as margin irrespecive of account equity. Perhaps the question should be How Much Leverage Do you use Leverage = Assets/Equity ???
i will use more margin when i think there's more opportunity, and will have credit on my account whwn i don't see it.