      If you scalp for a living, you will need to have a high success rate.In many market conditions, especially in the first and last hour of tradingeach day, scalping is a relatively easy way to make money. (I'm sure somewould disagree with me on this point.) With the cost of commissions atroughly $40 per round trip trade and the average gross profit per trade at$125, any sizeable losing position will really hurt your bottom line.