If a stock's movement between the time you buy it and the time you sell it hasn't increased by at least 1% before you sell it, then it wasn't worth buying in the first place. You have to account for the 1% commission when buying/shorting anything and 2% if you're going to reverse it long/short. I've been playing a long time and I've never really worried too much about commission until now, because when you have 75k shares, that's a lot bigger bite out of your port every time you make a trade. In theory, it will get worse when they up the shares one can hold to 100k (as will be the hits when you're holding a stock wrong)