IB will freeze my account if modification/execution ratio >50. what will happen if you go to supermarket and was told you must buy something otherwise do not come? what will happen if you were told you have been bid too much in eBay and cannot use ebay any more? Stores/company will die to have anyone visit them and they know it is only chance they can make money. I cannot believe IB will restrict customer to submit/modify their orders to get what? less order filled? so that IB can make less money? IB can always upgrade their hardware/software to accommodate order traffic. but it is out of IB's control to keep the customer and make them to trade! I hope IB can realize that and remove the ratio restriction. I want to warn future customers this restriction when they consider openning account in IB!