...At 500:1 and $6,000 max orders, I will still have $3,000,000 in buying power. Yes, $3 million for only $6k risked.
You will have 3,000 bucks in reserve only if the price of BTC does not change. But it is enough for the price to change by only 0.2% in the opposite direction to your expectations and your balance of $9,000 will be completely liquidated.