Sometimes the other side of the scalper can not hedge against the scalping strategy due to very short time. So it is one of the reasons they don't allow sclaping.
Please take a look around, and feel free to .
the reason is that it can overload the broker's server so that it overloads and can hang.
Yes, you are right. I agree. Scalping is very difficult if there is a server jam.Its more on traffic. If you notice if the volume of trade happen theirs always a slow down and sometimes you can see server busy or connection error when you trade. Its because the volume of activity is too much for a server to handle. And that's why they don't allow scalping or trade that is less than two minutes.