Hi, I show here the impact of SureTrader fixed commissions on 2 trades opened and closed with 400 shares (400+400).
Using BATS the rebate lets you pay $0 in Total (400+400). Using EGDX I paid $2.40 (400+400), 1.2 to short + 1.2 to cover the trade.
Total Suretrader Commission $19.80 on a realized of $56. A LOT!
With 400 shares you need 3 cents of profit to cover the overall commissions costs. But eanyway each cent gives to you $4 then looking for a 20cent/share of profit, you get good money.
SecFee and NasdFee are in any case cheaper. But realize $56 with 2 trades, to get only $33.63 or Net profit is not so good.
Trade 500 shares as minimum is definitely better, if you can do it. Only 2 cents/share to cover the costs and the risk of loss doesn't get a large impact by commissions.