Ok i talk with support and ask thiss question it`s look like if you trade big let say you trade with 1/5 mil units you could get $3 commisions this mean you get something like %45 decrease of commissions.Other way is if you increase your trading volume not just one moenth and stop if you increase your trading volume smooth you could also get lower commissins not as low as $3 but you could get lower commissions.I do want to share this info with you because i`m sure it will be goo info for all of us.Wish you good trading